Herbjarnarfellsvatnnafnorð hvorugkyn · ÖrnefniFallbeygingarEt.eintalaFt.fleirtalaEintalaNf.nefnifallHerbjarnarfellsvatnÞf.þolfallHerbjarnarfellsvatnÞgf.þágufallHerbjarnarfellsvatniEf.eignarfallHerbjarnarfellsvatns