What about "Aramis", "Athos" and "Porthos"? That's the names of the three musketeers (from the book by Alexandre Dumas). I like that combination myself, it's not extremely obvious, all those names work well solo but a fair amount of people will recognize them.
Another option would be "Huey, Duey and Louie"... Oh, and what about the elements combined with something else?
"Earthbreaker", "Whisperwind" and "Lashfire".