Galatea is a pretty beautiful name with an interesting etymology. It ages well, not too weird on a human being, and it just rolls off the tongue. I’d probably use it as a middle name.
This might sound a bit anecdotal, but I've yet to meet a single person who doesn't like this name. It sounds pleasant, and the meaning behind it is equally attractive.
Very very pretty and beautiful! It has grace and it sounds stellar, as it sounds like galaxy and its meaning (milky) reminds me of the Milky Way. 10/10 would use it.