Dublin because he was born in Ireland (County Limerick actually-but I was afraid the other kids would make fun of him if that was his name)
Fiona-because she is a white Eskie and Fiona means white. (We usually call her Fifi, though.)
Dempsey-after Jack Dempsey the boxer because my husband boxes for fun... (He also gets called Dingo alot because his ears never flopped down-he's a Sheltie with ears that stand up like a Yorkie-and my girlfriend said he looked like the dingo from that Meryl Streep movie. You know the one with the line "The dingo ate my baaaaby." that was imortalized on Seinfeld.)
Marley-after Bob Marley because I LOVE his music!! (He's another Sheltie and he gets called Marles a lot because he is so sweet and mellow.)
I'd be curious to see a thread with all the lovey-names / nicknames. They are usually the endearing ones!