I have a friend who calls me Lemon, some people call me Moogle, a professor once spent a whole semester calling me Tammy (completely NOT my name), and I've been known to respond to things like Red and Boobs.
Oh, and also, Appa. (Yeah. Avatar: The Last Airbender fans out there?)
When I was little my nickname was Boogaloo. Then my dad changed it to "North Ameican Four-Eyed, Three-Eared, Eight-Toed Schmioolet" The number of ears, eyes, etc changed every day. I have no idea how he even came up with this. Now, even though I am in college, he calls me "North American" for short.
My dad, brother, and uncle used to call me "mule lips" because once I said I wanted to change my name Ulric. My funny uncle jokingly said "what, you want to change your name to mule lips?" and it stuck.
My niece on the other hand calls me "Johnny" I don't know where she got as no one calls me that, but my name is actually Jonathan so I don't mind it.