Originally Posted by MachThreeSlug

My limited knowledge of Japanese seems to tell me that Flowering Peach is an accurate translation then. There's a high chance of me being wrong though.

You are not wrong. Flowering Peach or Flower Peach is direct translation of Hanamomo. Personally, I would like if Nutaku named her as Prunus Persica or Persica, give or take since Peach name is already used for her cousin.

Or rather, how about keeping her name as Hanamomo anyway? It seems cuter and fitting :P