From Middle English werwolf, from Old English werwulf, from Proto-West Germanic *werawulf, from Proto-West Germanic *wer ("man") + *wulf. Equivalent to or . Cognate with Dutch weerwolf, Low German Warwulf, German Werwolf, Danish varulv, Swedish varulv and even possibly Finnish vironsusi.
Compare also French garou, in loup-garou, French dialectal gairou, varou, Medieval Latin gerulphus, garulphus (from Germanic).
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