New mom Olivia Wilde was born Olivia Jane Cockburn. We're definitely not wild about that.
Helen Mirren's given name makes her sound a wee bit like a spy: Ilyena Vasilievna Mironoff.
Cee Lo Green
Before he was Cee Lo Green and a judge on The Voice, he was Thomas Callawy. We're unsure about the wigs.
Sean Kingston was born Kisean Jamal Anderson in Miami, Florida. He hit the scene in 2007 with the song "Beautiful Girls."
T.I. was born Clifford Joseph Harris, Jr. Where did T.I. come from? Q-Tip, one of his label mates when he was getting started in the industry.
And we just thought Bruce Willis was his real name. Say hello to Walter Willis everybody.
Nicolas Cage couldn't get lucky enough to be born with a cool last name like that. Nope. But he IS a Coppola, so there's that. (Nicholas Kim Coppola, to be exact.)
Whoopi Goldberg was born Caryn Elaine Johnson but adopted the name Whoopi due to her love of...fart jokes.
Stefani Joanne Angelina Germanotta is better known as Lady Gaga.
Sean John Combs has had many names throughout his musical career: Puffy, Puff Daddy, Diddy, P. Diddy., Diddy Dirty Money, and the list goes on.
Lil Wayne's arrest records read Dwayne Michael Carter, Jr.
Wouter De Backer or Gotye? Which is easier to say? Which is COOLER?
Ludacris aka Christopher Bridges is a rapper who loves fast cars. He starred in several Fast & Furious films with Vin Diesel and Paul Walker.
Rapper T-Pain hit the music scene in 2005 after changing his name from Faheem Rasheed Najm.
Trey Songz was a self-proclaimed shy kid who changed his name from Tremaine Neverson when he started singing.
Before becoming Jason Derulo, Jordin Sparks' boyfriend was known as Jason Desrouleaux. His name change was just a simple drop of some letters.
Jon Bon Jovi
The frontman for a band of the same name, Jon Bon Jovi was born John Francis Bongiovi.
LL Cool J
The ladies do love James Todd Smith, but they know him better as LL Cool J.
Marilyn Manson's identity has been cloaked in mystery with rumors abounding about his life before music. His name is Brian Hugh Warner to get you started.
Wiz Khalifa tweets selfies from jail where he's booked under the name Cameron Jibril Thomaz. Jail selfies.
Before he was a part of KISS, Gene Simmons was known as Chaim Witz.
Yeah, yeah, yeah...Lil Jon was born Jonathan Mortimer Smith. John Smith was way too plain for him, though.
Before she was officiating mass weddings at the Grammys, Queen Latifah was known as Dana Elaine Owens. Queen Dana? Queen Elaine? Yeah, Latifah works.
Shakira and Rihanna share more than a steamy video. Yep! Stage names! Shakira was born Isabel Mebarak Ripoll.
The artist formerly, and now once again, known as Prince was born Prince Rogers Nelson.
Something tells us Sting wouldn't be quite as sexy if he went by Gordon Sumner.
Tom Cruise shortened his name to match his stature. His given name is Thomas Cruise Mapother IV.
Kirk Douglas, father of Michael Douglas, was born Issur Danielovitch Demsky. Spartacus was definitely a Kirk and not an Issur.
From Batman to Beetlejuice, Michael Keaton was born Michael Douglas but changed his name to avoid confusion.
Avicii is a way cooler name than Tim Bergling. Tim Bergling sounds like...not a DJ.