|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 Castles and a second surname are found together
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