[JamesP81]

Don’t forget Geraldo Rivera / Jerry Rivers.

[jaydubya2]

Thats not entirely true according to snopes.com.
His birth name was Gerald Rivera.
http://www.snopes.com/media/celebrity/geraldo.asp

[raccoonradio]

I knew a lot of these. David Bowie had to change from his given David Jones to avoid confusion with one of the Monkees.
A soul singer, Barrence Whitfield, had to change his name
from his given monikker of...Barry White...similar reason.

Didn’t know about Manilow (my sister’s a huge fan). Pinkus?

Some “name droppers”:
Tom Cruise= Thomas Cruise Mapother
Ann Margret (Olson)
George Ivan “Van” Morrison

baseball division:
Anthony Nomar Garciaparra (goes by middle name, which is
his dad’s first name spelled backwards)

William Roger Clemens
Christopher Trotman “Trot” Nixon