If you're one of those people who thinks they know everything about every celebrity, think again. (Unless you happen to know who Ella Maria Lani Yelich-O'Connor is.)
Dozens of stars opt to change their real names before they are famous, choosing to go by more unique or interesting monikers. For instance, dear old Miley Cyrus was born Destiny Hope Cyrus, but officially changed her name in January 2008.
Here are some other celebrities whose real names will surprise you: