|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 Cassedy and a second surname are found together
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