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| Cassells | fairly numerous: Dublin, Midlands, Belfast. Ir. Ó Caisil, Ó Maolchaisil. See also Caslin. This is also a Scottish name, which could account some of those in Ulster. |
| Castles | Quite numerous: Belfast, N Down. English & Scottish but see also Cassells. |
Parishes where a Castle and a second surname married each other.
This list shows total Castle Roman Catholic marriages by county.
Click on the county to see detail.