My hunter loves changing pets all the time, so I've had a vulture named Leroyjenkins, a panther named Misterclaws, an alligator named Luggage, and an owl named (wait for it) Oreilly (but I had it before the auctioneer in Booty Bay, so I wasn't stealing). This forum thread has a bunch of great ones, too:
-a cat named Imwithstupid
-a gorilla named Kong
-a bird named Mango
-a spider named Phobia
-a wolf named DeeOhGee and a cat named SeeAaTee
I forgot about my pet lava spider, too-- that's him in the picture over there, his name was Fireball. Let's hear it. What's the best pet name you've ever seen or had?