I don\'t know about pet names, but I do believe my first name has been bastardized more times than any other name in the history of mankind. Some examples;
Lemon (which has stuck), Lavender, Lavatory, Love, Lovely, Lovin, La Van (French for \'The Van\', not), Layvan, Oven, Eleven and I could go on.
My father often calls me \'idiot\'.