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1Blake Lively

The actress was actually born Blake Ellender Brown but decided to take her mother's surname when she became an actress.
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2Meghan Markle

The Duchess of Sussex's first name is actually not Meghan, but Rachel, which is also the name of her character in Suits. The former actress goes by her middle name.
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3Reese Witherspoon
Her full name is actually Laura Jeanne Reese Witherspoon. The actress decided to be called Reese, which her mother’s maiden name.
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4Gigi Hadid
The model's real name is Jelena Hadid, but her mother gave her the nickname Gigi when Jelena became "too confusing".
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5Kit Harrington
Harington didn't know his real name was Christopher until he was 11 years old., with his full name being Christopher Catesby Harington.
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6Rihanna
Her real name is Robyn Rihanna Fenty and her family and friends still call her Robyn.
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7Lady Gaga
Okay, yes it's perhaps obvious that Lady Gaga wasn't the name she was given at birth. Her full name is Stefani Joanne Angelina Germanotta, but she got her stage name because of autocorrect changing "Radio Ga Ga" to "Lady Gaga" and it stuck.
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8Mindy Kaling
Her first name isn't actually Mindy, as her full name is Vera Mindy Chokalingam.
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9Dakota Fanning
She goes by her middle name Dakota, but her real name is Hannah Dakota Fanning.
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10Mila Kunis
Getty ImagesThe actress' name is Milena Markovna Kunis.
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11Tina Fey
Her birth name is Elizabeth Stamatina Fey and "Tina" is taken from her middle name.
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12Emma Stone
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13Julianne Moore
Born Julie Anne Smith, the actress chose to change her moniker before she hit Hollywood.
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14Katy Perry
The singer's surname is actually Hudson, but she changed it so as not to be confused with the actress, Kate Hudson.
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15Kim Cattrall
The Sex and the City star is actually called Clare Woodgate.
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16Lea Michele
The actress decided to drop her surname (Sarfati) and just go by her first two names.
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17Brad Pitt
Although it's not too far from where he ended up, the actor actually began life as William Bradley Pitt.
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18Natalie Portman
The Oscar-winning actress was actually born Natalie Hershlag.
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19Miley Cyrus
The singer was originally called Destiny Hope Cyrus, before legally changing her name and hitting the big time.
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20Olivia Wilde
The actress changed her name from Olivia Jane Cockburn before she became an actress.
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