I don't love
Nina but I think it's the nicest of the three. Straightforward and serious but also cute and fun. My only critique is the whole "it means girl in spanish" thing.
I tend to avoid
Clara because it's sort of ambiguous in pronunciation; I never know if she wants to be pronounced CLAA-ra or CLARE-a. Also, I usually find -ara names charming and humble, but I think
Clara is a little too precious. I guess I feel the same way about
Claire.
I want to like
Greta but I just don't think it sounds very nice. Maybe if I spoke a language where the T was pronounced and the name wasn't reduced to Gredda, I would like it better.
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"We are all horrible and wonderful and figuring it out." - Harris Wittels