April 9th is National Name Yourself Day. It's dedicated to the ultimate form of self-expression and encourages you to try on a new name for 24 hours. Here are 10 celebrities you may not know actually changed theirs.

It's widely known that Marilyn Monroe was originally Norma Jean Baker, and that Bob Dylan is really Robert Zimmerman. But Megan Markle, Vin Diesel, and Meg Ryan? Flip through our gallery below to see more stars that decided the name on their birth certificate wasn't Hollywood-worthy.

What would you call yourself if you were to give yourself a new name for one day? Let us know in the comment box below!

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