I love the name Xanthe, and if I'm lucky enough to have a girl this is definitely on the short-shortlist. However, although there's a (small) chance I could have a blonde daughter, brunette is far more likely. Even if my LO was born blonde it would be unlikely to last through to school age.
Would you use Xanthe for a brunette? Or is it so strongly associated with blondes (because of its meaning) that it would be weird to meet a brunette Xanthe?