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| Collen | fairly rare: Ulster etc. A variant of Cullen in Ulster. |
| Cullen | Very numerous: widespread all provinces, particularly S E Leinster. Ir. Ó Cuilinn, perhaps a personal name from cuileann, holly. The sept originated in Wicklow. The large numbers arise partly because of absorption of other names, e.g. Culhoun, Cullinan. IF. |
| Mac Cuillinn | Cullen: clann a bhain le deisceart Uladh ach tá an leagan galldaithe measctha leroinnt sloinnte eile anois agus ní féidir uimhreacha a thomhas. Cuilleann, an crann síor-ghlas, ba bhun leis an ainm, is cosúil.MIF. |
| MacCullen | rare: Down-Louth etc. Ir. Mac Cuilinn. Cuileann, holly, is used as a first name.. |
Parishes where McCullen and a second surname are both baptised.
This list shows total McCullen Roman Catholic baptisms by county.
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