Nina reminds me of the noise made by an ambulance siren - nee-na, nee-na...
I'd like it more if I could get that association out of my head! There's nothing wrong with it per se and it is refreshing as it isn't used too much. I think it goes fine with
Maya and
Maxwell, in fact, I'm so glad they've dropped the m theme I probably wouldn't care what the third baby was called!
Grace is a filler nn but again, it could have been much worse.
S xx