I once had a cat I renamed Damnit, because she insisted on breaking all my glassware. >_<
I still likes Ares. Aggro is funny though.
Sebastian? I had a cat named that once. My cats all had simple names (Strawberry, Midnight, Sebastian, Nikki, Samantha and Skipper, Bink (the odd one out), Damnit, Kahlua); the dog I had for a couple of weeks was Raider; and all my reptiles were chosen from mythology.
If you wanna mess with people, pick a name like Guess. My friend did that with one of his tarantulas. "Oh, what's it's name?" "Guess." "I hate guessing games, just tell me." "Guess." Heheh.