Well my FIL's name was William Williams. When he join the Marines and in boot camp, the commanding officer asked him his last name and he said Williams. Your first name sir.....William. No your first name.......William. Quit being smart your last name sir......Williams. Needless to say he has always had alot of problems with it and went by W.C. Williams when he could.
Also knew a Richard Dick.........you know Dick Dick for short!