Werewolf
late Old English werewulf ; the first element has usually been identified with Old English wer ‘man’. In modern use the word has been revived through folklore studies.
wiktionary
From Middle English werwolf, from Old English werwulf, from Proto-West Germanic *werawulf, from Proto-West Germanic *wer(“man”) + *wulf(“wolf”). Equivalent to wer + wolf or were- + wolf. 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(“werewolf”), Medieval Latin gerulphus, garulphus(“werewolf”) (from Germanic).
etymonline
werewolf (n.)
late Old English werewulf "person with the power to turn into a wolf," from wer "man, male person" (from PIE root *wi-ro- "man") + wulf (see wolf (n.); also see here for a short discussion of the mythology). Belief in them was widespread in the Middle Ages. Similar formation in Middle Dutch weerwolf, Old High German werwolf, Swedish varulf. In the ancient Persian calendar, the eighth month (October-November) was Varkazana-, literally "(Month of the) Wolf-Men."
