0 — No Chinese girl names start with U (by Hanyu Pinyin initial). Hanyu Pinyin does not use the letter U as a standalone initial for Mandarin given names; sounds that look like they begin with “u” are written with the glide letters W or Y in pinyin (for example, wu as in Wú 吴/武, and yu as in Yù 玉), so no standard Mandarin given-name syllable begins with the letter U on its own.

Consult the official Hanyu Pinyin orthography and basic Chinese phonology for the technical reason: Mandarin syllables either begin with a consonant or with a glide that pinyin represents as w or y, not as u. Expect common and culturally appropriate Chinese girl names to start with pinyin initials like W- (Wén 文, Wēn 温, Wěi 薇) or Y- (Yù 玉, Yǔ 雨, Yú 语) instead. If you specifically need Latin-letter names that begin with U, look at Cantonese romanizations or names from Chinese ethnic minorities and neighboring languages (for example, Mongolian Ulan or Uyghur names), but treat those as non‑Mandarin variants rather than standard Mandarin given names.