I was trying to think of an interesting and hopefully somewhat original idea for a fun thread, and this is the best I've come up with so far. Basically, if you're unsure of a Morrowind pronunciation, or have an idea and want to see what other people think, then this is the place to ask. Post as many you want at once, and be very careful to spell your pronunciations in very plain phonetics. You can name any person, place, or thing that you want, but try to keep it at least loosely tied to Morrowind.
I'll start with a few of my own.
Gnisis - I think the G is silent, so I say it 'Niss-Iss'
House Hlaalu - Originally I said it Hlah-Loo, where the first syllable is like saying 'Ha' with an L sound in the middle. Now adays I think it might be more 'Lay-Loo' instead, with a silent H.
Cosades - As in Caius Cosades. I say it 'Co-sades', like in Crusades. But I've heard people pronounce it 'Co-say-dees' similar to Mercedes.
Hopefully other people will have some inputs, and questions of their own.