Troll Shadow Knight surnames.

[Thulghor]

I am looking for some help with a surname for my Troll Shadow Knight of Cazic Thule, which I started messing around with again after a long five-year break on Green. Khargulkaronarr.

My headcannon is that the guy is championing Cazic Thule as a troll to prove the worth of trolls to Cazic Thule and that he/it was wrong to abandon them. Although from what I understand, most trolls don't really care about this issue. Plus it's the hipster choice since it seems like every Shadow Knight these days is all about Innoruuk.

I was thinking Thulesworn as a surname. Should it be Thulesworn, or Thulsworn? Weirdly if I put it in Google it talks about roof covers or something. The other names I was thinking are Spinebreaker, Gutripper, or Fearmonger.

What do you guys think?