| Barron | numerous: mainly Ulster and Leinster. Derived from Mac Bearáin in Ulster and Barún in Kilkenny-Waterford where they were a branch of the Fitzgeralds. The title "baron" was also common amongst the Scots so we find MacBarron there. MIF. |
| Barún | Barron: Leas-ainm ar chlann Ghearaltach i gCill Chainnigh. Féach Ó Bearáin. |
| Beirne | numerous: Roscommon/Leitrim, E. Leinster. Ir. Ó Beirn, derived from Norse Bjorn. There were two N.Connacht septs of this name. In Leinster it is a synonym of Byrne, which is a totally different name, Ó Broin. IF & SGG. |
| Ó Bearáin | Barron, Barnes, Barrington: líonmhar in Ultaibh & Laighin; bhain "Mac" leis na Niallaigh agus bhí Barún ina chraobh des na Gearaltaigh i gCill Chainnigh. Bíonn Barnes i bhfeidhm mar chomh-ainm le Barron, uaireannta. Bhí an t-ainm Bearach coitinn in anallód: brí: biorach, ar nós sleá. |
| Ó Beirn | Beirne, O'Beirne: líonmhar: Ros Comáin-Liatroim. Bhí clann i Ros Comáin agus ceann eile i Maigh Eo. Is ón ainm Lochlannach Bjorn an sloinne. Daoine den sloinne seo in oirthear Laighean, baineann siad le Ó Broin, clann difriúil. IF. |
| Ó Birn | O'Beirne: comhionann le Ó Beirn, q.v. |
| O'Beirne | numerous: Sligo-Roscommon-Leitrim-W Meath etc. Ir. Ó Beirn, from Norse first name Bjorn. A sept associated with the Mac Dermotts in Roscommon. IF. |
Parishes where Barron and a second surname are found together
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