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| Mac Niocláis | Mac Nicholas: cuíosach líonmhar: Maigh Eo-Gaillimh. Ainm sinseartha a ghlac muintir de Burgo (na Búrcaigh) chucu i Maigh Eo. |
| MacNicholas | fairly numerous: Mayo-Galway etc. Ir. Mac Niocláis. A name adopted by the De Burgos in Connacht and always associated with Mayo. MIF. |
| Nicholas | fairly rare: Derry-Tyrone etc. English, from popular first name of Greek origin, spelled Nikolaos and meaning "victory people". DBS. |
Parishes where McNicol and a second surname are both baptised.