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| Marren | Quite numerous: Sligo-Mayo etc. Ir. O Mearáin, mear, lively. Apparently separate from the sept in Monaghan. See Marron.MIF. |
| Marron | numerous: Monaghan-Down-Antrim, Louth-Meath etc. Ir. Ó Mearáin, mear, lively. A sept of Monaghan. See also Marren. SI. |
Parishes where McMarron and a second surname are both baptised.
This list shows total McMarron Roman Catholic baptisms by county.
Click on the county to see detail.