Kevin's full name is Kevin Buster Bluth Voldemort, and generally when using his name, he's addressed as Kevin, Kev, or Kevlar.
My girlfriend is always calling him silly things, and some of them stick. For a while, when he was a puppy and pulling on the leash a lot, we tried using a harness on him. He was known as the reindeer. He's gotten bigger, and we got rid of the harness, so now he's the dinosaur.
And my favorite - bucket. Not sure why it's so funny, but to me it is. Little bucket running around doing bucket things, with half-brained bucket schemes running around in his head....