OK, one small rant and I'll answer.
What is it with these fantasy names? Are people really supposed to pronounce them? And look at the humanoid races. If I can't prononce something, how is an illithid - a guy with a squid for a head - supposed to prounounce anything. Hey, here's an experiement you can try at home:
1) Turn your head into a squid.
2) Say the word "illithid"
I'll bet you can't do it.
Anyway ....
KOO-AH-TWO-AH and SAH-UH-JIN
or (more honestly):
"The fish guys who worship that naked crawdad chick" and "the shark guys"