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| Bresnan | rare: Munster. See Brosnan. |
| Bresnihan | rare: Scattered. See Brosnan. |
| Brosnan | numerous: Kerry, Limerick, Cork, Clare etc. Ir. Ó Brosnacháin. A Kerry name, probably derived from the placename Brosna.MIF. |
| Ó Brosnacháin | rare: Ir.Lang. See Brosnan. |
| Ó Brosnacháin | Brosnahan, Brosnan: líonmhar: Ciarraí-Luimneach-Corcaigh-Clár. Ceaptar gur ón sráid-bhaile Brosnach, Ciarraí, an sloinne seo. |
Parishes where Brusnan and a second surname are both baptised.