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| de Fréins | French: líon beag: Loch Garman, Gaillimh. Ceann de "Threabhanna na Gaillimhe". Is cosúil gur Francach agus ní frêne atá annso. Féach Frínseach, leis. |
| Ffrench | Quite numerous: Roscommon, Wexford, Meath etc. Anglo-Normans who settled in Wexford and Galway, whence one of the "Tribes of Galway". The Welsh "ff" for normal "f" arose in 16 cent. The name also occurs as French. Ir. Frinseach. |
| French | numerous: E Ulster, Wexford, Waterford etc. Ir. Frínseach. One of the "Tribes of Galway" and long connected with Roscommon. Scottish & English, denoting French origin. IF. |
| Frinseach | French: líonmhar: Ulaidh, Oir-dheisceart. Ceann de "Threabhanna na Gaillimhe" agus baint acu le Ros Comáin. Sasanaigh de bhunadh Francach. IF. |
Parishes where a French and a second surname married each other.
This list shows total French Roman Catholic marriages by county.
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