For a guild name, I made a list of random things off the top of my head. If y'all see anything you like let me know.

Heresy
LostOnes
The Forgotten
Children of the Raze
Bloodwood
Hell's Fury
The Loveless
Of the Sun
Of the Moon
Molded Souls

P.S. I am intentionally trying to come up with something that is not unique, because from the few guild oriented RPs I've played it seems to be like that. Unless, the AI had already created guilds and you are perhaps, randomly assigned to one and already given a name. Perhaps after the initial setup guilds can trade players just like baseball teams trade? This would allow for a new character to come in should another die.