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| Cassidy | Very numerous: Ulster, N Leinster, Dublin etc. Ir. Ó Caiside. Physicians to the Maguires of Fermanagh, they were dispersed in the Plantation of Ulster. IF. |
| Ó Caiside | Cassidy: an-líonmhar in Ultaibh, Laighin Thuaidh & rl. Ó thús, clann léannta a bhain le Mag Uidhir Fhear Manach.IF. |
| O Casaide | rare: Dublin etc. Ir.Lang. See Cassidy. |
Parishes where Cassady and a second surname are both baptised.
This list shows total Cassady Roman Catholic baptisms by county.
Click on the county to see detail.