English were-

← Old English werwulf (inherited)

← Old English wer (mention)

← Old English wulf (mention)

← English werewolf (back-formation)

← Proto-Indo-European *wiHrós (derived)

→ English were (mention)

→ English werecow (affix)

→ English werehog (affix)

→ English wereman (affix)

→ Icelandic ver (cognate)

→ Latin vir (mention)

→ Telugu వీరము (cognate)

→ Telugu వీరుడు (cognate)

→ Telugu వీర (cognate)