Family name origins & meanings
- Irish : shortened Anglicized form of Gaelic Ó hAiseadha ‘descendant of Aisidh’, a personal name meaning ‘discord’, ‘strife’.
- English and Irish : shortened form of the habitational name Blennerhasset, from a place in Cumbria, so named from Celtic blain ‘summit’ + an unexplained second element + Old Scandinavian hey ‘hay’ + sǽtr ‘shieling’.