I mean, it sounds nice in English but at least in Portugal it's not very well-liked (not saying everyone hates it, but most people I met don't really like it)
I love the hyacinth flower, but using Hyacinth as a name just sounds ugly to me. Jacinta, however, sounds beautiful. It's also spelled beautifully. I feel like this would be a fun name to sign papers with, mostly because of the loopy J at the beginning.