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| Boylan | numerous: Dublin and Ulster (Oriel). Ir. Ó Baoighealláin. A sept related to the O'Flanagans and located in Monaghan. IF & SGG. |
| Ó Baoighealláin | Boylan: líonmhar in Oirghialla, Áth Cliath agus ar fud Uladh. Clann ársa de chuid Oirghialla. Féach Baoigheall. Litriú nua: Ó Baíolláin. IF. |
Parishes where Boylan and a second surname are both baptised.
This list shows total Boylan Roman Catholic baptisms by county.
Click on the county to see detail.