Kate Middleton and Meghan Markle at Wimbledon 2018.Photo:Karwai Tang/WireImage

Catherine, Duchess of Cambridge and Meghan, Duchess of Sussex attend day twelve of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 14, 2018 in London, England.

Karwai Tang/WireImage

But sometimes, another moniker becomes so popular that it’s how the public best knows the royal. How many of these caught you thinking, “Who knew?”

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Kate Middleton is actually Catherine

Kate Middleton, the Princess of Wales, in January 2023.Chris Jackson - WPA Pool/Getty Images

Catherine, Princess of Wales arrives at the Windsor Family Hub on June 06, 2023 in Windsor, England

Chris Jackson - WPA Pool/Getty Images

Nickname: KateFull name at birth: Catherine Elizabeth MiddletonCurrent royal title: The Princess of Wales

The Princess of Wales was born to Michael and Carole Middleton as Catherine. Kate reportedly became a popular nickname during her college years, when she was studying art history at the University of St. Andrews in Scotland — where she first met Prince William.

02of 07Meghan Markle’s first name is RachelMeghan Markle in December 2022.Mike Coppola/GettyNickname: MeghanFull name at birth: Rachel Meghan MarkleCurrent royal title: The Duchess of SussexDid you know that Meghan is actually her middle name? But long before meeting and marrying Prince Harry, she was known as Meghan — or “Meg” to close friends. Rachel is still her legal first name, and “Rachel Meghan” appeared on her son Prince Archie’sbirth certificate.Coincidentally, Meghan’s character onSuits —on which she starred from 2011 to 2017 — is called Rachel Zane.

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Meghan Markle’s first name is Rachel

Meghan Markle in December 2022.Mike Coppola/Getty

NEW YORK, NEW YORK - DECEMBER 06: Meghan, Duchess of Sussex attends the 2022 Robert F. Kennedy Human Rights Ripple of Hope Gala at New York Hilton on December 06, 2022 in New York City. (Photo by Mike Coppola/Getty Images for 2022 Robert F. Kennedy Human Rights Ripple of Hope Gala)

Nickname: MeghanFull name at birth: Rachel Meghan MarkleCurrent royal title: The Duchess of Sussex

Did you know that Meghan is actually her middle name? But long before meeting and marrying Prince Harry, she was known as Meghan — or “Meg” to close friends. Rachel is still her legal first name, and “Rachel Meghan” appeared on her son Prince Archie’sbirth certificate.

Coincidentally, Meghan’s character onSuits —on which she starred from 2011 to 2017 — is called Rachel Zane.

03of 07Prince Harry is a nickname for HenryPrince Harry in June 2023.Karwai Tang/WireImageNickname: HarryFull name at birth: Henry Charles Albert DavidCurrent royal title: The Duke of SussexDespite what’s on his birth certificate, King Charles and Princess Diana’s younger son has popularly been known as Harry since he was born.During a call with a young boy named Henry in October 2022, the princetold him, “My name is Henry. Well, everyone calls me Harry. I have no idea why.”

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Prince Harry is a nickname for Henry

Prince Harry in June 2023.Karwai Tang/WireImage

Prince Harry

Nickname: HarryFull name at birth: Henry Charles Albert DavidCurrent royal title: The Duke of Sussex

Despite what’s on his birth certificate, King Charles and Princess Diana’s younger son has popularly been known as Harry since he was born.

During a call with a young boy named Henry in October 2022, the princetold him, “My name is Henry. Well, everyone calls me Harry. I have no idea why.”

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Pippa’s full name is Philippa

Pippa Middleton attends the ‘Together at Christmas’ community carol service at Westminster Abbey on December 8, 2021 in London, England. The carol service, hosted and spearheaded by The Duchess of Cambridge, pays tribute to the work of individuals and organisations across the UK who have supported their communities through the COVID-19 pandemic

Nickname: PippaFull name at birth: Philippa Charlotte MiddletonCurrent royal title: None

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Princess Lili is really Lilibet

Meghan Markle and Prince Harry in April 2022.Samir Hussein/WireImage

Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend the athletics on day two of the Invictus Games 2020 at Zuiderpark on April 17, 2022 in The Hague, Netherlands.

Samir Hussein/WireImage

Nickname: LiliFull name at birth: Lilibet Diana Mountbatten-WindsorCurrent royal title: Princess Lilibet

King Charles' granddaughter is also known as Lili, which relates to one of Meghan’s nicknames. Meghan’s mom,Doria Ragland, gave her the childhood nickname “Flower.” In a blog post on her now-defunct lifestyle site, The Tig, Meghan shared her nicknames: “Meg, MM, M&M, and Flower (which my mom has called me since I was little).”

06of 07Fergie comes from Sarah Ferguson’s last nameSarah Ferguson in March 2023.Michael Loccisano/Getty ImagesNickname: FergieFull name at birth: Sarah Margaret FergusonCurrent royal title: Duchess of YorkPrincess Beatrice and Princess Eugenie’s mother is popularly known as Fergie, a nickname taken from her last name.“Someone asked me, ‘If you were an astronaut and you could take all the pressure off you, would you leave behind Fergie and Sarah and the Duchess and your past mistakes and failings?'” the Duchess of Yorkpreviously told PEOPLE. “And I said, ‘What are you talking about? They’re all my friends.’ I made friends with past mistakes. I made friends with Fergie. She didn’t know any better. And then Sarah. That’s why we experiment. How is it that we’re meant to be knowledgeable when we don’t know? My Fergie, my Duchess, my Sarah: They’re all good people.”

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Fergie comes from Sarah Ferguson’s last name

Sarah Ferguson in March 2023.Michael Loccisano/Getty Images

Sarah Ferguson, Duchess of York poses at Sarah Ferguson, Duchess of York In Conversation With Samantha Barry

Michael Loccisano/Getty Images

Nickname: FergieFull name at birth: Sarah Margaret FergusonCurrent royal title: Duchess of York

Princess Beatrice and Princess Eugenie’s mother is popularly known as Fergie, a nickname taken from her last name.

“Someone asked me, ‘If you were an astronaut and you could take all the pressure off you, would you leave behind Fergie and Sarah and the Duchess and your past mistakes and failings?'” the Duchess of Yorkpreviously told PEOPLE. “And I said, ‘What are you talking about? They’re all my friends.’ I made friends with past mistakes. I made friends with Fergie. She didn’t know any better. And then Sarah. That’s why we experiment. How is it that we’re meant to be knowledgeable when we don’t know? My Fergie, my Duchess, my Sarah: They’re all good people.”

07of 07King George VI had a different birth name (and a nickname!)King George VI.Underwood Archives/GettyNickname: King George VI/BertieFull name at birth: Albert Frederick Arthur GeorgeQueen Elizabeth and King Charles may have kept their birth names when they acceded to the throne, but it was quite normal for monarchs to change their names. Queen Elizabeth’s father was known as Bertie throughout his life, a spin on his name Albert. But when he became sovereign, he took the name George after his father, King George V (who was born with the same first name).

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King George VI had a different birth name (and a nickname!)

King George VI.Underwood Archives/Getty

His Majesty King George VI, wearing his uniform as Admiral of the Fleet, London, England, May 4, 1937. He served as a gunner during World War I at the Battle of Jutland.

Nickname: King George VI/BertieFull name at birth: Albert Frederick Arthur George

Queen Elizabeth and King Charles may have kept their birth names when they acceded to the throne, but it was quite normal for monarchs to change their names. Queen Elizabeth’s father was known as Bertie throughout his life, a spin on his name Albert. But when he became sovereign, he took the name George after his father, King George V (who was born with the same first name).

source: people.com