| Breen | Very numerous: Fermanagh & Ulster generally, Dublin, South East, Mid-West. Ir. Mac Braoin, a sept of Kilkenny and Ó Braoin, septs of the Midlands & Roscommon.This name occurs as O'Brien and Bruen in some areas. Braon, an early personal name. IF. |
| Brian | rare: Down etc. Ir. Ó Briain, but in this case, Scottish. The personal name Brian was popular amongst the Normans who got it from their Breton allies and so it found its way to Scotland independently of its Irish currency. SS & GPN. |
| Brien | fairly numerous: Dublin etc. See Bryan and O'Brien. |
| Bryan | numerous: Ulster, Dublin, Cork, South East. Anglo-Norman associated with Kilkenny. The prevalence in Fermanagh suggests Mac Braoin, a branch of Mac Manus, but the large numbers in the Belfast area are likely to be of Scottish origin. |
| Mac Braoin | Breen, Mac Brien: Is deacair idirdealú le Ó Braoin ach bhí clann Mac Braoin in Osraí agus is cosúil gur leo-san a bhaineann na Braonaigh san Oir-Deisceart. Bhí dream eile i bhFear Manach. Bhí clann bheag in oirthear Luimnigh sa 16 céad. IF. |
| Ó Braoin | Very rare: Ir.Lang. See Breen. |
| Ó Braoin | Breen, Bruen: an-líonmhar ar fud na tíre: Fear Manach, Oir-Deisceart & Meán-Iarthair ach go h-áirithe; Bruen i gConnachta. Luann de Bhulbh ceithre chlann in áiteanna éagsúla - an dream ba mhó suite gar d' Áth Luain. Bhí clann eile bunaithe i Ráth Bhoth, Tír Chonaill. An bhrí atá aige ar an ainm Braon ná "brón". |
| Ó Briain | Quite numerous: Dublin etc. Ir.Lang. See O'Brien. |
| Ó Briain | O'Brien: an-líonmhar ar fad, go h-áirithe sa Chlár agus Luimneach. Shíolraigh an Brianaigh ó Bhrian Bóirmhe, "Imperator Scotorum". Ceann de chlanna móra na h-Éireann a bhí pháirteach i stair na tíre (ní i gcónaí ar an dtaobh cheart) ó Chath Chluain Tarbh go dtí an lá inniu. Ceiltis, Brigonos, uasal. GPN, SGG, IF &MIF. |
| O'Brien | Very numerous: all areas, most in Munster and Leinster. Ir. Ó Briain. Leading sept of Thomond (Clare-Limerick), owing prominence to Brian Boru, High-King 1002-1014 A.D. The first name Brian is an old Celtic one, meaning perhaps "noble". GPN. |
| O'Bryan | rare: Ulster. Variant of O'Brien, q.v. |
DEDs where O'Briene and a second surname are found together
This list shows total 1901 O'Briene households by county.
Click on the county to see detail.
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