The Saboteurs? No, that sounds too French... The Deep Six? Oh, but we won't be six anymore when Sage joins us. Uh...

The Seven Deadly Sins? No, I just tried matching up the sins to our characters and they don't fit... The Seven Samurai? I mean, I guess that one's a little too obvious...

Shit, I don't know. What we can probably do is wait until our group does something noteworthy in-universe and then name it after that somehow. Like if they blow something up (which is a real possibility, I'm sure), they can be the Blast Gang... or, y'know, something else that [i]doesn't[/i] sound stupid.