I normally name my team based on some sort of mythology as well. I sometimes name them after Egyptian gods, (Jesus they have a good many of 'em Around 15 or twenty last time I checked.), Norse gods, hindu gods, Greek gods, legendary creatures like hydras, Cerberus, medusa, things like that.
Anything in any mythology is fair game for my nicknames usually.
Though I also just sometimes name them something based on their type. Like Gengar I often name 'Nightmare' or 'Shadow' Or some other variation of dark sounding names.