After rereading trello again, I had wanted to come up with a few last names for several cultures:
Savarian- Basit, Khan, Vidal
Doomyrian- Gyre, Stern, Tyrian
Skylian- Morales, Ibarra, Brady
Alalean- Fletcher, Carter, White
Canopian- Valencia, Torres, Quistador
Keihatsu- あにめ
If you got any other sick ideas, tell em 
Yes there are other cultures I didnt do but i didnt bother
delete keihatsu
even tho keihatsu is asian, the name should still be written in english.
scottish/scandinavian clan names(gaelic names) for the vikings. e.g.: Mathieson, Askelson, Bjerk, Haugrud
https://www.familyeducation.com/baby-names/browse-origin/surname/scandinavian for some ideas.
New Greekians: (WoM ancient text here)
I just wrote “Anime” in japanese for it. I have little to no ideas for it other than Lee and Jungkook
bout to suggest my own last name for vikings 
lmao thats exactly what i did , guess which one is mine 
(dm’s)
inb4 alaleans get the one up on house names and have ‘Gold’ as one of them compared to castlians’ ‘Silver’
oh shit you’re not wrong yo
you can get alalean with nordic names like bjorn, olaf, rolf, etc, im guessing they’re gonna be changed to the new viking culture
u can get alalean with any first name, even the asian sounding ones. last names are not determined by what ur first name is. some dude could be called Muhammad Uchiha if he wanted(just an example)