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| Haggarty | rare: Belfast etc. Ir. Ó h-Ágartaigh; Ó h-Ógartaigh, from fógartach "one who is proclaimed an outlaw". Alternatively, Ó h-Éigeartaigh, éigeart = injustice. This latter usually appears as Hegarty, q.v. |
| Hegarty | Very numerous: all areas: especially Cork, Derry-Donegal, Connacht etc. The Irish is Ó h-Éigeartaigh (unjust). A sept of Cineál Eoghain in Derry. There was another group, a branch of the Eoghanacht who were the ruling group in Munster, in Cork. IF & SGG. |
| Heggarty | Quite numerous: Antrim. See Haggarty and Hegarty. |
| Ó h-Éigeartaigh | rare: Dublin, Cork etc. Ir.Lang. See Hegarty and O'Hegarty. |
| Ó h-Éigeartaigh | (O)Hegarty: an-líonmhar ins gach aird, i gCorcaigh & i nDoire go sonrach. Clann de Chineál Eoghain in iarthar Uladh ó thús iad, ach craobh d'Eoghanacht na Mumhan, leis. Éigeartach = éagórach - aisteach go leor, bhí sé coitinn sa Mhumhain. |
| O'Hegarty | rare: Dublin etc. Ir. Ó h-Éigeartaigh (unjust). A sept of Cinéal Eoghain in Derry-Donegal, some of whom moved to Cork; the name usually appears as Hegarty, q.v. and sometimes as Haggerty in America. IF. |
Parishes where Higgerty and a second surname are both baptised.