Here's a couple ideas, although none of them that great:

Bobby the Boia ('boia' means 'executioner' in Italian)

Crazy Tony (or any other name)

Pinky

Jackie the Joke Man

Magic Mikey

Johnny the Jew


"Don Corleone, I am honored and grateful that you have invited me to your daughter... 's wedding... on the day of your daughter's wedding. And I hope their first child be a masculine child. I pledge my ever-ending loyalty."