Julianne Moore

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Real Name: Julie Anne Smith

If Julianne Moore would have it her way, she wouldn’t change her name. But it was the Actors Guild’s insistence — all of the variations of the actresses’ real name were taken by that point. So she joined her fist and middle name and added her father’s middle name into the mix.

Louis C.K.

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Real Name: Louis Szekely

Here’s a nice way to make the world say your last name properly: just change the spelling. That’s how the comedian’s real last name Szekely turned into cryptic C.K. Guess it’s not because he’s such a Calvin Klein fan after all.