O Brigan. A Sept / Family branch, who had their territory in Co. Cork in Desmond / Des Mhumhain / Southern Munster.

O Brigen -

O Brinane or O Brennan. A Sept / Family branch, who had their territory in Co. Cork in Desmond / Des Mhumhain / Southern Munster.

Mac Brin or Mac Brinn - Irish / Mheic Broin - bran / raven. A Sept / Family branch, who had their territory in Co. Down in the south - east of the Ulster Province.

O Briody - Irish / Ua Bruaideadha (Descended from Bruaided) A Sept / Family branch, who had their territory in the north of Co. Longford  in the north - west of Northern Leinster and nearby in the west of Co. Cavan in Southern Ulster.

Briscoe. English toponymic origins. They have been in Ireland since the 16th Century AD.

Mac Britany - Irish / Mheic Breatnaigh. A Sept / Family branch, who had their territory in Co. Antrim in the north - east of the Ulster Province now known as Mac Bratney.

Brocas. French origins. They were in Co. Dublin in the north - east of Southern Leinster in the 17th Century AD.

Brock / broc / badger. English origins -

O Broder or O Broderick or O Browder - Irish / Ua Bruadair. A Sept / Family branch, who had their territory at Barrymore in Co. Cork in Desmond / Des Mhumhain / Southern Munster and they also had a branch in the Heremonian Ui Laoghaire Ui Connla kingdom of Ossory in Co. Kilkenny in the south - west of Southern Leinster.

Broder or Broderick or Browder - Irish / Ua Bruadair. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht.

Brodie. A Scottish form of O Brollaghan.

O Broder, or O Broderick, which see - Irish / Ua Bruadiar. A Sept / Family branch, who had their territory in Co. Cork and Co. Limerick in the Munster Province and nearby in Co. Galway in Southern Connacht.

O Brodar. A Sept / Family branch, who were Chiefs in their territory in Co. Donegal in the north - west of the Ulster Province.

O Brodar. Kings in Ossory / Co. Kilkenny in the south - west of Southern Leinster.

O Broderick - Irish / Ua Bruadiar. A Sept / Family branch, who had their territory in Co. Cork and nearby in Co. Limerick in the Munster Province and Co. Galway in Southern Connacht. Also see O Broder.

O Brody - Irish / Ua Bruaideadha. (Descended from Bruaided) A Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province.

Mac Brody - Irish / Mheic Bruaideadha. (Descended from a son of Bruaided) A Literary Sept / Family branch, who had their territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster who were Brehon Lawyers, who were with the Heberian Dal gCais Ui mBriain O Briens. See also - Briody.

O Brogan - Irish / Ua Brogain. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Fiachrach Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. They were also in Co. Cavan in Southern Ulster, Co. Sligo in the north - west of Connacht, and Co. Laois in the mid - west of Southern Leinster. Ancestors: *87.Fiachra the original 2nd King of Connacht (Ui Fiachrach), *86.Eochy "Mugmedon" the 124th King of Tara / Ireland.

O Brofie. An Irian Laeghis / Ui Laoighis Sept / Family branch, of the O More / O Moore / Ui Mordha, who had their territory in Co. Laois in the mid - north - west of Southern Leinster, and nearby in Co. Kilkenny in the south - west of Southern Leinster. Especially see - O Brophy.

O Brohan - Irish / Ua Brouachain. A Sept / Family branch, who had their territory in Co. Offaly in the north - west of Southern Leinster. They were also known as Banks, which see.

Mac Brohoon. Used as a synonym for Mac Brehony or Mac Abraham, which see, Irish / Mheic an Breitheamhan.