| Families |
Ethnic Group |
Branch of |
| Bohannon |
|
Buchanan |
| Bolan, Boland |
IVL - Mayo, SLigo, Clare |
|
| Bolan, Boland |
Gaels |
O'Beolain (Drumcliffe) |
| Bolan, Boland |
Gaels |
O'Brolan |
| Bowie |
|
MacDonald (Clan Donald) |
| Boyle |
IVL - South Scotland |
|
| Brady |
|
O'Grady |
| Brady |
IVL - Leinster |
|
| Brallaghan |
|
O'Brollaghan |
| Brandon |
Normans |
Fitzmaurice (Kerry) |
| Brandon |
IVL |
|
| Brien |
IVL |
|
| Brieve |
|
Morrison |
| Brodie |
Cruithne |
|
| Brodie (Argyle) |
|
O'Brollaghan |
| Brolochan (Argyle) |
|
O'Brollaghan |
| Brown |
|
Lamont |
| Brown |
IVL - South Scotland |
|
| Browne |
IVL - Ireland |
|
| Browne |
Normans |
Tribes of Galway |
| Bruce |
Normans |
|
| Buchan |
Cruithne |
|
| Buchanan |
Gaels |
|
| Burke, Bourke |
Normans |
|
| Burness, Burnes, Burns |
|
Campbell |
| Burness, Burnes, Burns |
IVL - South Scotland |
|
| Burns |
|
O'Beirne |
| Burns |
|
O'Bryne |
| Burns |
IVL - Ireland (not Ulster) |
|
| Butler |
Normans |
|
| Butter, Buttar |
Normans |
|
| Byrne |
IVL |
|
| Caddell |
|
Campbell |
| Caddell |
|
Blake |
| Cairney |
Gaels |
O'Beolain |
| Calder |
|
Campbell |
| Callaghan |
IVL - Oriel |
|
| Callendar, Callander |
Normans |
|
| Cameron |
Erainn |
|
| Campbell |
Errainn |
|
| Carney |
(Rare) |
Fox |
| Carney |
(Rare) |
O'Neill (Ulster) |
| Carney |
|
O'Kearney (Mayo, Tipperary) |
| Carron |
IVL - Ulster |
|
| Carry |
IVL - Ulster, Galway |
|
| Carthy |
|
MacCarthy |
| Carthy |
|
O'Carry |
| Carthy |
IVL - Connacht |
|
| Cattanach |
|
MacPherson |
|
