Anybody else seen this month's G.Q.? Kramers in the back, in a section devoted to sideburns. He' also mentioned, in the Dave Letterman article, as a nowhere man. G.Q. says the Kramer's full name is 'Bob Geldof Kramer'.
Well actaully there's a picture of Bob above him, but if you edit or cut the page just right, then you've got proof of his first name.