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| Berreen | Very rare: Sligo. Ir. Ó Birín. Variant of Ó Bioráin, Birrane, q.v. |
| Birrane | rare: Limerick, Mayo. Ir. Ó Bioráin. (bior = spike) Has been changed to Byrne and Byron in Munster and Connacht, to some extent. Ir. Ó Bearáin is a synonym. SGG. |
| Ó Bioráin | Birrane: annamh: Luimneach, Maigh Eo. Cuid acu aistrithe go Byrne agus Byron. Deir de Bhulbh gur ionann biorán agus stócach. Féac Ó Bearáin leis. |
Parishes where a Birreen and a second surname married each other.
This list shows total Birreen Roman Catholic marriages by county.
Click on the county to see detail.