What about Undine?
Undine comes from the Latin word "unda" which means wave, so "Undine" translates to "little wave" which, come on, that's ADORABLE. If you're drawn to water or are having a water sign baby or it feels like they're happily swimming around in utero, perhaps a water inspired name will do the trick. An alternative spelling to this is Ondine. It has a pretty sound, almost French in phonetics. It's so rare to find pretty names that start with the last few letters of the alphabet - how often do you ever meet someone with a name that starts with the letter U? This would be Unique for sure.