I pronounce spht: Spit and pronounce iago: eye-a-go
I pronounce sidoh: Sihdow.
I initially pronounced iago "eye - aye - go," but I've realized that was wrong and now see it as "yah - go."
Spht seems to be ss - fit to me, but I don't know. It's a weird name.
I'm actually unsure of the correct pronounciation of "Sidoh," since it's not a real word or name, but I say "Sigh - Dough." "Sid - Oh" works fine too, though.