圣女 means 'holy maiden' (saint).
贞德 (Zhēndé) is the phonetic transcription of 'd'Arc' — but the characters were chosen carefully:
贞 (chastity/loyalty) +
德 (virtue), capturing exactly her saintly image. A French peasant girl who claimed visions, led troops at the siege of Orléans (1429), was burned as a heretic at 19, and canonized in 1920.
