Not even Ygraine? so romantic! not that I would want to be one. It would even be quite good with my multi-vowel Arabic last name. (married name) though.
Yvette and
Yvonne are "old lady" names where I live, though I do like
Yvette.
Xanthippe-that sounds like a form of musical composition, a sprightly little bit you'd play on a flute.