We have the same problem over here. Its funny because they usually never hear their given name. Ill give you some examples.
Buns
1. Stinky: Stink Pot, Tink, Tinky, Tinker, Stinky Bunny
2. Lucky: Luck duck, Lucky Bunny
Chins
1. Charlie: Charles, Bean, Charlie Bean, Fat man
2. Bonnie: Bon Bon...