I'm GM of a bunch of different guilds.
These include:
outsiders - first guild
is kind of a big deal - it puts the guild name under yours, do the math
union local 1337 - a play off of a worker's union leage (my pvp guild)
ClassCultureAndViolence - a misunderstood Rancid lyric
there's plenty of serious and not so serious names out there, have fun choosing what sits right with yuo and where you wanna go with it.
also, I'm on Eredar playername: Protojones (recent switch to horde, hehe)