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| Laffan | fairly numerous: South East, N Munster etc. Ir. Lafán. Anglo-Normans in 14 cent. Derivation: French: l'enfant (child) or La Font (place-name). SI, SGG and Dauzat. |
| Laffin | fairly rare: Derry-Tyrone etc. Variant of Loughlin, q.v. |
Parishes where a Laffan and a second surname married each other.
This list shows total Laffan Roman Catholic marriages by county.
Click on the county to see detail.