Some celebrities are household names, but there are a few who weren't born with the name you know them by. Click ahead to see ten famous people who either changed their name or use a better-known stage name.

Alicia Keys

Before she was tickling the ivories and belting out songs as Alicia Keys, this crooner was known as Alicia Augello Cook.

Aaron Paul

The "Breaking Bad" actor uses his middle name as a last name, transforming from Aaron Paul Sturtevant to simply Aaron Paul.

Elton John

Elton John is a name known around the world. But the flamboyant singer was actually born under the name Reginald Kenneth Dwight.

Jennifer Anniston

"Friends" and rom-com actress Jennifer Aniston technically didn't change her name – her father did! The actress' family name Anistassakis was changed to Aniston while her father pursued his own acting career.

Portia de Rossi

Portia de Rossi, actress and wife of Ellen DeGeneres was previously known as Amanda Lee Rogers.

Katy Perry

Katy Perry is one of the world's most famous pop stars. But before she became known for her vocals and wild sense of fashion, the singer was known as Katheryn Elizabeth Hudson.

Miley Cyrus

Miley Cyrus was born under another name, and no, it wasn't Hannah Montana. It was Destiny Hope Cyrus.

John Legend

John Legend uses his stage name in public but was named John Roger Stephens at birth. He's still a legend in our book.

Bruno Mars

The world knows him as Bruno Mars, a soulful singer with a unique sense of style. However, the celeb was born in Hawaii as Peter Gene Hernandez.

Olivia Wilde

It's pretty interesting that Olivia Wilde was born with a different name. The actress' real name is actually Olivia Jane Cockburn.