Blizzard used Thalassian to describe the race as well.
In the Blood Elf heritage quest line there are NPCs names “Thalassian Priest” as an example.
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https://wow.gamepedia.com/Thalassian_Priest
I believe it’s like calling night elves Darnassian or Nightborne Suramarian.
Thalassian works because they’re from Quel’thalas.
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Oh yay, we’re also on the next page of this thread.
I’m tired af atm but expect more high elf art tomorrow