Games: Design 'em, rewrite 'em, play 'em!
Bear in mind with Mythos pronunciations that these are not Earthly names, and the spellings are merely the closest replication possible with our alphabet and voicebox.
Quite right. In some of Lovecraft's stories, mostly the ones written with August Derleth, there is mention of many alternate spellings of Cthulhu such as Katahloo and Theylau.
When saying the names out loud I think we should emulate Dorie's attempts at whale speech in Finding Nemo.