I've had a couple from friends and from students.
One group of friends in highschool called me "Duce" (Doo-Chay as in Mussolini). I'd have expected that from the students. :)
Another group of friends called me "Sausage".
Many students called me a movie character (sci-fi) that was a play on my last name. It wasn't mean spirited, but I'm not sharing only cuz I'm trying to avoid being DFed and haven't revealed my full name to everyone on this board.