I like both
Zara and
Eliza but definitely not
Gianna, they are too similar. Also, until I read what you had written at the bottom I would have pronounced
Gianna as it is writeen Gee-AHN-uh (to rhyme a bit with banana) like
Gianni etc....
My vote is for
Eliza Mae-I think it is very pretty and goes with
Gemma Rose.