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| Ó Seanáin | Shannon: líonmhar: gach aird, ach freagraíonn Shannon do thrí shloinne Gaelach: bíonn Ó Seanacháin & Mac Giolla t-Seanáin i gceist, chomh maith. Bhí Ó Seanáin i gCeatharlach & Loch Garman i anallód. Ón ainm Seanán a bhí coitinn sa Chlár. |
| Shannon | Very numerous: all areas, especially Ulster. Ir. (1) Ó Seanáin. (2) Mac Giolla t-Seanáin (Giltenan). (3) Ó Seanacháin (Shanahan). This is one of the "omnibus" names but it is mainly a variant of Shanahan, q.v. IF. |
Parishes where a Shannon and a second surname married each other.
This list shows total Shannon Roman Catholic marriages by county.
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