1)
Kaia2)
Kaja3) KY-ah, which is also what I prefer
4) Yes, it does. The reason I prefer
Kaia to Kaya is that I probably would pronounce the latter KAY-ah, my less preferred pronunciation.
I can never decide if I like this name or not. Mostly because I can't decide what I think of my main association, a "kaja" in Swedish ...
http://en.wikipedia.org/wiki/Western_Jackdaw