It's official, no-one agrees on how to pronounce i! I feel better about that since it was the monster that I had the most trouble trying to pronounce. Unfortunately for me they have figured in my campaign on multiple occasions. I think that I just resorted to calling them sea devils, which is what the locals would call them anyway. Locathah also got renamed to fish-men, although I had an easier time in pronouncing them.
That there are so many different pronounciations of the word is a bit of a rarity. Normally people have 1 or 2 different ways that people argue over. Sahuagin seem to have about 10+ different variations.
Olaf the Stout