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| MacStay | Quite numerous: Down-Armagh. Ir. Ó Maoilstéighe. An ecclesiastical family of Down. |
| MacStea | rare: Armagh etc. See Mac Stay. Mod. Ó Maoilsté. |
| Ó Maoilstéige | Mac Stay: líon beag: an Dún-Ard Mhacha. Clann eaglasta i nDroim Mór, an Dún, tráth. |
Parishes where McStaye and a second surname are both baptised.
This list shows total McStaye Roman Catholic baptisms by county.
Click on the county to see detail.