Separated At Birth?
Brady Anderson & Chris Issak
Michael Anthony & Martin St. Louis
Matthew Broderick & Greg Maddux
Harry Connick, Jr. & Bill Guerin
Tie Domi & Henry Rollins
Peter Gammons & Andrew Jackson
Bob Geldof & Jerry Seinfeld
Ferguson Jenkins & Phil Lynott
Jerry Jones & Jerry Owens (of Owens Country Sausage)
Jim Kaat & Randy Quaid
Geddy Lee & Mike Ricci
Brad Lukowich & Krist Novoselic
Tommy Shaw & Zane Smith
(more to be added as I think of them...)