The name Fenrir is a boy's name meaning "fen-dweller". Fenrir.
From the experts:
The name of a monstrous wolf in Norse legend, who kills the god Odin and is then killed himself by one of Odin’s sons. HarryPotter author J.K. Rowling used the name for one of her most terrifying
characters: the evil werewolf Fenrir Greyback.