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| Day | fairly numerous: Dublin, Belfast, Cork and scattered. Presumably English from the distribution but the name undoubtedly represents Ó Deá (O'Dea) also. The latter, original spelling Ó Deaghaidh, were an important sept of Thomond (Clare). |
Parishes where a Day and a second surname married each other.
This list shows total Day Roman Catholic marriages by county.
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