I haven't had the time to look through everything on my own, but other than Norse or Norsemen (which the later didn't make the consideration list apparently) I'm coming around to Roughnecks, Reapers and Berzerkers. Personally, I want a short one or two syllable name, or one that can easily be shortened to one or two syllables (which I'm not really feeling 'Zerkers for Berzerkers).