köken: Inherited from Middle French dune, from Old French dune, from Middle Dutch dūne (modern Dutch duin), from Old Dutch dūn, dūno, from Proto-West Germanic *dūnā (“hill”), of uncertain origin. More at Proto-West Germanic *dūnā.
köken: Borrowed from Middle Dutch dūne, from Proto-West Germanic *dūnā (“hill”), from Proto-Celtic *dūnom (“stronghold”), from Proto-Indo-European *dʰuHnom (“enclosure”), derived from the root *dʰewh₂- (“to finish, come full circle”).
köken: From Middle Dutch dûne, from Old Dutch dūn, dūno, from Proto-West Germanic *dūnā, of uncertain origin, perhaps from Proto-Celtic *dūnom (“stronghold, rampart”).
Via Middle Low German from Middle Dutch dûne, from Old Dutch dūna, from Proto-Germanic *dūnǭ. Middle Dutch origin is assured by the German -ü- (compare Süden). The more common Middle Low German form was dûne (with a back vowel -u-); this form may be originally Low German or an earlier borrowing from Dutch. Compare modern Dutch duin.