In reply to the question raised by the awesome Kathryn @ Sponne School:
Sorry dude, you’ll probably want to slap me when you hear the explanation as I didn’t take a huge jump in imagination to come up with the name. I wanted to write about two races other than humans that could spin magic over different elements: a race that could control wood and trees and another that could master stone and rock. So (big breathe!) tree people or tree men simply became tre-men then finally Tremen and yeah, you got it, Stone men ended up being Sto-men, then Stomen!
All the funkiest!
Mx