|Rohan||fairly rare: Munster and South East, especially Kerry and Clare. Ir. Ó Robhacháin, from robhach, crafty. In Ulster, it is Ó Ruadhacháin, dimin. of ruadh, red-haired. MIF.|
|Roughan||Quite numerous: Clare etc. Ir. Ó Robhacháin, dimin. from robhach, crafty. See Rohan.|
Parishes where Roohan and a second surname are found together
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