Sometimes the name you were given at birth just doesn't flow off the lips, or it may not be "catchy" or "gimmicky" enough to get attention or easily remember. Maybe it sounds too similiar to someone who is already famous.

Or perhaps Just one name works best, like Madonna. You'll notice with the list before the reason some of the stars have done the name change thing:

Akon - Aliaune Damala Akon Thiam
Fergie - Stacey Ann Furguson
Katy Perry - Katy Hudson
Bruno Mars - Peter Gene Hernandez
Jamie Fox - Eric Marlon Bishop
Demi Moore - Demi Gene Guynes
Tina Fey - Elizabeth Stamatina Fey
Spike Lee - Shelton Jackson
Pink - Alicia Beth Moore
Elton John - Reginald Dwight
Stevie Wonder - Steveland Morris
Dakota Fanning - Hannah Dakota Fanning
Barry Manilow - Barry Pincus
Jodie Foster - Alicia Christian Foster
Alicia Keys - Alicia Cook
Meg Ryan - Margaret Hyra
Lady Gaga - Stephanie Germanotta