Aerosmith vocalist Steven Tyler's real name:

Steve Tallarico

Source: Rolling Stone Encyclopedia of Rock, 1/1/1900

 
   
  Original name of "The Four Tops":

The Four Aims
The original Four Tops were Obie Benson, Abdul Fakir, Lawrence Payton, and Levi Stubbs.
Source: New York Times, 7/2/2005