Oona Gray Seppala grew up only a few steps away from television fame, yet she has never tried to turn herself into a celebrity. She is the older daughter of Suits actress Sarah Rafferty and finance professional Santtu Seppälä. Oona spent part of her childhood moving between Los Angeles and Toronto while her mother played Donna Paulsen, visited the Suits set with her younger sister, and grew up knowing many people connected with the show. Now 18, she remains surprisingly private, with no confirmed acting career, public college announcement, or reliable personal net-worth figure.
Who Is Oona Gray Seppala?
Oona Gray Seppala is the eldest daughter of actress Sarah Rafferty and her husband, Santtu Seppälä.
People confirms that Sarah and Santtu have two daughters. Oona came first in 2007, followed by her younger sister, Iris Friday, in 2012.
Oona became known mainly because of her mother’s fame.
Sarah spent nine seasons playing Donna Paulsen on Suits, one of the most popular characters on the legal drama.
Years later, Sarah found a new generation of viewers through Netflix’s My Life with the Walter Boys, where she plays Katherine Walter. Netflix continues to list Sarah among the show’s main stars.
Oona, however, has not followed her mother into a public acting career.
That difference is one of the most interesting things about her.
When Was Oona Gray Seppala Born?
Oona Gray Seppälä was born on October 22, 2007.
People gives the full date in its January 2026 profile of Sarah Rafferty’s children.
The date is also supported by IMDb’s biographical information about Sarah Rafferty.
Sarah celebrated Oona’s 13th birthday publicly in 2020 and wrote about how emotional it felt to suddenly have a teenager. People later included that family moment in its profile.
Unlike many celebrity-child birthdays copied from unknown websites, Oona’s date has good support.
How Old Is Oona Gray Seppala in 2026?
Oona is 18 years old as of August 2026.
She will turn 19 on October 22, 2026.
Some websites may already list her as 19 because they simply subtract 2007 from 2026.
That is not how birthdays work.
Think about it like this.
She does not become 19 until her birthday actually arrives in October.
So for most of 2026, including August, Oona Gray Seppala is 18.
Why Is Her Surname Sometimes Written Seppala and Sometimes Seppälä?
The more accurate Finnish spelling of the family surname is Seppälä.
The two dots over the “a” are part of the Finnish spelling.
English-language searches and websites often remove those marks and write Seppala instead. People itself commonly uses Seppälä in text while search queries may appear without the accent.
So Oona Gray Seppala and Oona Gray Seppälä refer to the same person.
There is no mystery.
It is simply a spelling difference caused by language and keyboard use.
Who Is Oona Gray Seppala’s Mother?
Oona’s mother is Sarah Rafferty.
Sarah became internationally known as Donna Paulsen on Suits. She later joined Netflix’s My Life with the Walter Boys as Katherine Walter.
Her career stretches much further than those two shows.
She has also worked in television projects including Grey’s Anatomy and Chicago Med, among many other screen roles.
But Sarah has often made it clear that motherhood is a major part of her life.
In People’s family profile, she said her life revolves around her children and described herself as deeply grateful for her two daughters.
That helps explain why Oona and Iris appear in some of Sarah’s family stories without being turned into full-time public figures.
Who Is Oona Gray Seppala’s Father?
Oona’s father is Santtu Seppälä, whose full name is Aleksanteri Olli-Pekka Seppälä.
He works in business and finance rather than entertainment.
People reports that Santtu was born and raised in Finland and is a citizen of both Finland and the United States.
He studied at Yale University and later earned an MBA from the Wharton School at the University of Pennsylvania.
His professional career has included investment banking, investment management and business development. People reports that he later became Vice President of Strategy and Business Development at Angeleno Group in Los Angeles.
This means Oona grew up with parents working in two very different fields.
Her mother worked in acting.
Her father worked in finance and business.
Is Oona Gray Seppala Finnish?
Oona is American through her family life and birth background, while she also has clear Finnish family roots through her father.
Santtu was born and raised in Finland before building his adult life and career in the United States.
That gives Oona a family connection to both American and Finnish culture.
Some small biography websites go further and make very detailed claims about which languages Oona speaks or how strongly she identifies with Finnish culture.
Those claims are not firmly confirmed.
Her Finnish heritage through Santtu is clear.
Personal details about how Oona herself describes that heritage are more private.
How Did Sarah Rafferty and Santtu Seppälä Meet?
Oona’s parents met long before she was born.
Sarah and Santtu were both students at Yale University.
Sarah was studying acting, while Santtu was moving toward a finance career. They dated for several years before marrying.
Their wedding took place on June 23, 2001.
People reports that the couple celebrated 20 years of marriage in 2021. They have now been married for more than 25 years as of 2026.
Oona arrived about six years after their wedding.
Iris followed several years later.
Does Oona Gray Seppala Have a Sister?
Yes.
Oona has one younger sister named Iris Friday Seppälä.
Iris was born on January 27, 2012.
That makes Oona a little more than four years older than her sister.
Sarah has spoken warmly about the girls’ relationship.
In an older parenting interview recalled by People, she described both daughters as affectionate, funny and close to each other.
Because Iris is still a minor in 2026, her private life should be handled carefully.
There is no need to publish school information, addresses or other personal details.
Did Oona Gray Seppala Grow Up in Los Angeles?
Los Angeles was the family’s home base, but Oona’s childhood was more unusual than simply growing up in one city.
During the years Sarah filmed Suits, the family regularly moved between Los Angeles and Toronto.
People reports that this meant Oona attended two different schools.
Sarah admitted that she initially worried about how the arrangement would affect her daughter.
Instead, she later said Oona handled the change well and grew in confidence from the experience.
That gives us one of the clearest pictures of Oona’s early life.
She was not simply watching her mother leave for months of filming.
The family often moved together.
Why Did Oona Spend So Much Time in Toronto?
Toronto was where Suits was filmed.
Sarah played Donna Paulsen from the show’s beginning through its final season.
Rather than spending long stretches separated from her husband and children, Sarah and Santtu decided that the family would move as a unit during production periods.
Oona therefore experienced Toronto as part of normal childhood life.
She attended school there.
She spent time around the production.
Then the family would return to Los Angeles.
For a child, that was a very different routine from staying in the same neighborhood every year.
Did Oona Gray Seppala Visit the Suits Set?
Yes.
Sarah has said that both Oona and Iris regularly visited her on the Suits set.
People reports that the girls enjoyed craft services, the hair and makeup trailer and wardrobe fittings.
At times, they even got dressed in expensive clothes from the wardrobe department for fun.
Sarah later described photographs from those moments as special family memories.
That sounds glamorous.
But to Oona, it may simply have felt like visiting her mother at work.
That is the strange part of growing up with an actor as a parent.
A television studio can become part of ordinary family life.
Did Oona Watch Suits?
Interestingly, Sarah has said that her daughters did not really watch Suits even though they spent time on its set.
In a 2024 interview discussed by People, Sarah explained that her daughters were close to the cast and production world but did not become regular viewers of the show.
That makes sense when you think about it.
To fans, Sarah Rafferty is Donna Paulsen.
To Oona, Sarah is simply her mother.
Watching your mother play a romantic or dramatic television character can feel very different from watching an unrelated actor.
Did Oona Watch My Life with the Walter Boys?
Sarah’s daughters were more interested in My Life with the Walter Boys.
People reports that the girls watched the Netflix series, with Iris especially excited about Sarah joining the show.
Netflix lists Sarah as Katherine Walter, one of the main adult characters in the family drama.
The difference is interesting.
Oona and Iris grew up around Suits without becoming fans of it.
A newer show starring their mother was apparently easier for them to enjoy.
Did Oona Gray Seppala Attend the Royal Wedding?
Sarah Rafferty and Santtu Seppälä attended Prince Harry and Meghan Markle’s wedding at St. George’s Chapel in Windsor in May 2018.
USA Network’s profile of the couple includes a photograph of Sarah and Santtu arriving at the ceremony.
However, strong coverage reviewed here does not clearly establish that Oona personally attended the ceremony.
Some celebrity biography websites say the entire family went.
That should not automatically be treated as fact.
The confirmed public evidence clearly shows Sarah and Santtu at the royal wedding.
Oona’s presence should not be claimed without stronger evidence.
Is Oona Gray Seppala Friends With the Suits Cast’s Children?
Sarah has said her daughters became close to members of the Suits family because they spent so much time around the set.
People reports that Oona and Iris were close to the cast and their families during those years.
Online fan pages sometimes give very specific claims about Oona’s friendships with individual celebrity children.
Those private friendship details are harder to verify.
It is safer to say she grew up around the Suits cast and their families without trying to map every childhood friendship.
What Did Sarah Rafferty Teach Oona Growing Up?
Sarah has spoken publicly about wanting Oona to feel confident and safe talking to her parents.
When Oona was eight, Sarah explained that she wanted her daughter to stay true to herself and know she could discuss anything with her family.
Sarah also said she hoped Oona would feel confident when she eventually became more independent.
That gives a rare look at the parenting style inside the Rafferty-Seppälä home.
The focus was not simply on giving the children unusual experiences.
It was also on keeping family communication strong.
Where Did Oona Gray Seppala Go to School?
This is where reliable information becomes much more limited.
People confirms that Oona attended schools in both Los Angeles and Toronto during her childhood because of Sarah’s filming schedule.
However, strong public sources do not provide the names of her schools.
That is a good thing.
Publishing the exact school of a celebrity’s child can create unnecessary privacy concerns.
Now that Oona is 18, some newer websites claim to know where she attended high school or where she plans to study next.
Those claims do not have strong enough support to present as confirmed facts.
Did Oona Gray Seppala Graduate From High School?
Oona reached the normal age for completing high school around 2025 or 2026.
Fan accounts have posted references to an “Oona graduation,” but reliable mainstream coverage reviewed for this article has not clearly documented the school, graduation date or next educational step.
That means the careful answer is:
Oona is now college age, but the details of her high-school graduation and current education have not been publicly confirmed by a strong source.
There is no need to guess the college.
Does Oona Gray Seppala Go to College?
No reliable mainstream source currently confirms which college Oona attends, whether she has enrolled, or what subject she may be studying.
People’s updated January 2026 profile gives her age and childhood history but does not name a university.
This is an important correction to many biography pages.
Some websites confidently list a university, degree or career plan without showing original evidence.
Those claims should be treated carefully.
At 18, Oona may be studying, working, taking time before college or exploring different paths.
That decision belongs to her unless she chooses to make it public.
Is Oona Gray Seppala an Actress?
There is no confirmed professional acting career for Oona Gray Seppala.
She grew up around acting.
She visited Suits sets.
Her mother is a successful actress.
None of that automatically makes Oona an actress.
People’s detailed profile does not mention professional acting credits for her.
IMDb also lists Oona mainly through Sarah Rafferty’s family information rather than through a professional acting filmography.
So articles describing her as an actress or “rising Hollywood star” are getting ahead of the evidence.
Does Oona Want to Follow Sarah Rafferty Into Acting?
That is not publicly confirmed.
It is easy to create that story.
A famous actress has a daughter.
The daughter grows up visiting television sets.
Therefore, people assume she will become an actress too.
Real life does not always work that way.
Oona’s father built a career in finance and business.
Her mother built a career in acting.
Oona may choose either world or something completely different.
There is no strong public interview in which she announces a professional acting goal.
Does Oona Gray Seppala Work in Finance Like Her Father?
There is also no confirmed finance career.
Santtu has a long professional history in investment management and business development. People says he worked in investment management for about two decades before moving into his later business-development position.
That does not mean Oona automatically shares his career interests.
Some biography sites try to guess that she may enter finance because of her father.
That is speculation.
At 18, her professional path remains private.
Is Oona Gray Seppala on Instagram?
There is no widely verified major public social-media account that can safely be identified as Oona’s official celebrity page.
Search engines produce pages using her name and fan content.
That is not the same as a verified account controlled by Oona herself.
Her mother occasionally posts family photographs, and People uses some of Sarah’s Instagram images when discussing Oona.
But Oona has not built a major public influencer identity.
That fits with the larger pattern of her life.
She grew up near fame without trying to make fame her own career.
Is Oona Gray Seppala Dating Anyone?
Oona’s romantic life is not publicly confirmed by a reliable mainstream source.
At 18, she is also a very young private person.
There is no good reason to turn photographs, follows or fan posts into dating claims.
Unless Oona chooses to publicly discuss a relationship herself, it is better to leave that part of her life alone.
That is both more accurate and more respectful.
What Is Oona Gray Seppala’s Net Worth?
Oona Gray Seppala’s personal net worth is not publicly verified.
Several biography websites give numbers.
Those numbers should not be treated seriously unless they can show financial records.
Oona has no confirmed major acting career or public business that would allow outsiders to reasonably estimate her personal wealth.
Her parents’ finances are also not her personal net worth.
Santtu has had a successful career in finance and business, while Sarah has worked as an actress for decades.
That tells us Oona grew up in a professionally successful family.
It does not tell us how much money belongs personally to her.
Does Oona Gray Seppala Have Her Own Career?
As of August 2026, no major public career has been confirmed.
There are no reliable mainstream reports identifying Oona as a professional actress, model, influencer, business owner or finance professional.
That may change.
She is only 18.
Many people at that age are still choosing education and career paths.
The absence of a public job title is not unusual.
What would be unusual is pretending to know her future before she has publicly revealed it.
Why Is Oona Gray Seppala Famous?
Oona is mainly known because she is Sarah Rafferty’s daughter.
Sarah’s role as Donna Paulsen created a huge fan base through Suits, and the show later found another large audience through streaming.
Sarah’s newer role in My Life with the Walter Boys has introduced her to younger viewers too. Netflix continues to feature her in the series.
When viewers become interested in an actor, they often search for their spouse and children.
That is how Oona’s name became searchable.
She has not created celebrity fame in the usual sense.
What Facts About Oona Gray Seppala Are Often Wrong Online?
The biggest problem is career claims.
Some sites call Oona an actress even though no reliable acting career is documented.
Another problem is education.
Oona attended schools in Los Angeles and Toronto as a child, but her later high-school and college details remain private.
Her age is sometimes wrong because websites fail to check whether her October birthday has passed.
She is 18 in August 2026, not 19.
Her net worth is another weak claim.
There is no verified personal figure.
Her dating life is not publicly established either.
Finally, websites sometimes remove the Finnish marks from her surname.
Seppala and Seppälä refer to the same family name.
Why Has Oona Gray Seppala Stayed So Private?
The answer may partly come from her parents.
People and USA Network both describe Sarah and Santtu as fairly private about their family life.
Sarah occasionally shares loving family moments.
But she does not appear to have built her daughters into part of a celebrity brand.
That allowed Oona to experience unusual things without having every stage of childhood turned into entertainment news.
She could visit a television set.
She could live in two cities.
She could grow up around famous actors.
And she could still remain mostly private.
What Makes Oona Gray Seppala’s Story Interesting?
Oona’s story is interesting because it is almost the opposite of what people expect from a celebrity child.
Her mother starred on a globally popular television show.
Oona spent years visiting the production.
She knew the cast and their families.
She experienced Los Angeles and Toronto as part of childhood.
Yet she did not suddenly launch an acting career.
She did not become a reality-TV personality.
She did not build a giant public social-media account.
Instead, she reached adulthood with much of her own life still private.
In the internet age, that may be more unusual than becoming famous.
Final Thoughts
Oona Gray Seppala is the eldest daughter of Sarah Rafferty and Santtu Seppälä.
She was born on October 22, 2007, which makes her 18 years old in August 2026. She will turn 19 in October.
Her younger sister, Iris Friday Seppälä, was born in January 2012.
The girls grew up inside a family that mixed acting and finance.
Sarah became famous as Donna Paulsen on Suits and now stars in My Life with the Walter Boys. Santtu built a long career in investment management and business development.
Oona’s childhood was unusual.
Because Suits filmed in Toronto while the family’s main base was Los Angeles, she attended school in both places. Sarah later said the arrangement helped build her daughter’s confidence rather than hurting it.
Oona and Iris also spent time on the Suits set.
They visited hair and makeup, wardrobe and craft services and became familiar with the cast and their families.
But Oona did not turn that experience into a public acting career.
At least not yet.
There is no reliable confirmed college, acting job, business, relationship or personal net-worth figure attached to her in strong public sources.
Those missing details should stay missing until Oona chooses to share them.
That may be the clearest way to understand Oona Gray Seppala today.
She grew up close to fame.
She knows what television life looks like from behind the scenes.
But as she enters adulthood, she still seems to have something many celebrity children lose very early: the freedom to decide privately who she wants to become.
FAQs About Oona Gray Seppala
Who is Oona Gray Seppala?
Oona Gray Seppala is the eldest daughter of Suits and My Life with the Walter Boys actress Sarah Rafferty and finance professional Santtu Seppälä.
When was Oona Gray Seppala born?
She was born on October 22, 2007.
How old is Oona Gray Seppala in 2026?
Oona is 18 years old in August 2026. She will turn 19 on October 22, 2026.
Who is Oona Gray Seppala’s mother?
Her mother is Sarah Rafferty, an actress best known for playing Donna Paulsen on Suits and Katherine Walter on Netflix’s My Life with the Walter Boys.
Who is Oona Gray Seppala’s father?
Her father is Santtu Seppälä, a Finnish-American finance and business professional who studied at Yale and Wharton.
Does Oona Gray Seppala have a sister?
Yes. Her younger sister is Iris Friday Seppälä, who was born on January 27, 2012.
Is Oona Gray Seppala Finnish?
She has Finnish roots through her father, who was born and raised in Finland and holds both Finnish and American citizenship.
Where did Oona Gray Seppala grow up?
Her family used Los Angeles as a home base, but Oona also spent long periods in Toronto while Sarah filmed Suits. She attended schools in both cities during childhood.
Did Oona Gray Seppala visit the Suits set?
Yes. Sarah has said Oona and Iris often visited the set and enjoyed the wardrobe, hair and makeup areas and craft services.
Did Oona Gray Seppala watch Suits?
Sarah has said her daughters did not really watch Suits, even though they regularly visited its set and knew the cast and their families.
Is Oona Gray Seppala an actress?
No confirmed professional acting career is documented for Oona as of August 2026.
Does Oona Gray Seppala go to college?
Her current university or college plans have not been reliably confirmed by a major public source.
What does Oona Gray Seppala do for a living?
No confirmed full-time profession has been publicly established. She is only 18 and appears to keep her education and career plans private.
Is Oona Gray Seppala on Instagram?
There is no widely verified public celebrity Instagram account clearly confirmed as belonging to Oona.
Is Oona Gray Seppala dating anyone?
Her current relationship status is not publicly confirmed by reliable mainstream sources.
What is Oona Gray Seppala’s net worth?
Her personal net worth is not publicly verified. Exact figures on celebrity biography websites should be treated as guesses.
Are Sarah Rafferty and Santtu Seppälä still married?
Yes. Current People coverage continues to identify Sarah and Santtu as married after more than two decades together.
When did Oona’s parents get married?
Sarah Rafferty and Santtu Seppälä married on June 23, 2001.
Why is Oona Gray Seppala famous?
She is primarily known as Sarah Rafferty’s eldest daughter. Interest also comes from her unusual childhood between Los Angeles and Toronto and her years growing up around the Suits set.
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