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| Mac an Leagha | Mac Clay, Mac Alea: cuíosach líonmhar: Tír Chonaill-Doire-Aontroim-an Dún. Bhí clanna éagsúla ach ba i dtuaisceart Uladh ba mhó iad. Lucht leighis, ar ndóigh. |
| MacClay | fairly numerous: Derry-Donegal-Antrim etc. Ir. Mac an Leagha (son of the physician). A medical family of Antrim. SI. |
| MacLea | rare: Antrim etc. As Mac Lay. |
| MacLeigh | rare: Down etc. Ir. Mac an Leagha. See Mac Clay . |
Parishes where a McLeigh and a second surname married each other.
This list shows total McLeigh Roman Catholic marriages by county.
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