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| Craughan | rare: Meath. The Irish is possibly Ó Creacháin, though this is of Mayo origin. |
| Croghan | fairly rare: E Connacht, Cork etc. Ir. Mac Conchruachan. "hound of Cruachan" - the royal seat of Connacht. Also as Crown(e) and Croan (Down). MIF. |
| Croughan | Very rare: E Galway. See Croghan. |
| Mac Conchruachan | Croghan, Crowne: cuíosach annamh: Ros Comáin & rl. Is cosúil gur ón sean-láthair ríoga i gConnachta an t-ainm seo.MIF. |
| Mac Criomhthainn | Mac Crohan: annamh: Ciarraí-Luimneach. Clann de chuid Uí Shúileabháin i gCorca Dhuibhne agus Uíbh Ráthach. Níl an réimhír "Ó" ceart de réir staire. Ciallaíonn criomhthann: sionnach. Ar aon chuma, cuimhneófar ar Thomás Ó Criomhthainn (1856-1937), "An t-Oileánach", fhad 's a bheidh Gaeil beo in Éirinn.MIF. |
| MacCrohan | Quite numerous: Kerry-Limerick etc. Ir. Mac Criomhthainn. From an early first name meaning "fox". A curious anomaly is the name of the Blasket Island writer Tomás Ó Criomhthainn. See also Croghan. |
Parishes where Crohan and a second surname are both baptised.
This list shows total Crohan Roman Catholic baptisms by county.
Click on the county to see detail.