Etymology tree Proto-Indo-European *wl̥kʷós? Proto-Indo-European *wĺ̥kʷos Proto-Germanic *wulfaz Proto-West Germanic *wulf Old English wulf Middle English wolf English wolf Proto-Indo-European *-iskos Proto-Germanic *-iskaz Proto-West Germanic *-isk Old English -isċ Middle English -ish English -ish English wolfish From wolf + -ish.