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|Grennan||fairly numerous: Offaly, Wexford, Mayo. Ir. Ó Grianáin, grian, sun, was a feminine name in Irish legend. However, the name is of Norman origin in Leinster. MIF.|
|Grennon||rare: Dublin. See Grennan.|
Parishes where a McGrennan and a second surname married each other.
This list shows total McGrennan Roman Catholic marriages by county and parish.
Click on the parish to go to the listing of parish records.