Tina Fey

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Real Name: Elizabeth Samantha Fey

Tina Fey probably had zero trouble getting used to people calling her Liz on set of 30 Rock since it is her real name.

Olivia Wilde

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Real Name: Olivia Jane Cockburn

If Olivia Wilde wanted to pursue a career in journalism, she’d be smart to keep her real last name since both her parents are acclaimed journalists. But she was interested in acting since a young age as evident by her last name — she got an idea for a new last name after participating in an Oscar Wilde play back in her teenage years.

Natalie Portman

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Real Name: Neta-Lee Herschlag

When picking a catchier last name, Natalie also paid respects to her grandmother — Portman was her maiden name. She also turned her given Hebrew name Neta-Lee into Americanized Natalie.