I also would like to know how Nyim is pronounced (Nigh-im) or (Nyhme)?

I agree that a 2 syllable first name would go better with a 1 syllable middle name.
So if its pronounced with 1 syllable, definitely Ava or Scarlett- although I still like Jade!
Something about the name Ava with that middle name (just looking at it written) seems to work well. I think the 2 names 'suit' each other - if you know what I mean.