Italian immigrants called him Bambino, teammates called him Jidge (a diminutive of George) and the press called him the Sultan of Swat. The Babe himself was terrible with names, referring to most veterans as Doc, and everyone else as Kid.
A human postscript to all this is Sammy (Babe Ruth's Legs) Byrd, the Babe's late-inning defensive replacement. Baseball historian Bill James knows of no other nickname quite like it: "No one was ever called Mark Belanger's Bat or anything."
How best to express the essence of the nickname? Take a guy like Larry (Larry) Cox, who last played for the Chicago Cubs and who bears a striking resemblance to the Three Stooges' Larry Fine. "His name is Larry," a teammate once said, introducing Cox to a third party, "but everyone calls him Larry."