wiktionary
ref
From Hebrew יְהוּדִית (Y'hudít, “woman from Judea, Jewess”)
etymonline
ref
Judith
fem. proper name, from Latin, from Greek Ioudith, from Hebrew Yehudith, fem. of Yehudha, literally "son of Judah" (see Judah). Judy is a pet form of it.
