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Garou can mean many things.
From the French "loup-garou", meaning "werewolf." "Loup" means "wolf" (from the Latin "lupus", meaning the same), and "garou" descends from the Frankish "wariwulf" ("werewolf", in case it's not obvious) though a long sequence of typically French sound changes.
Additionally: Japanese word, Garou, meaning Hungry Wolf