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| Layden | fairly rare: Leitrim-Sligo etc. Variant of Lydon, q.v. |
| Leaden | Very rare: Dublin, Ulster. |
| Leyden | numerous: Connacht, N Munster etc. Ir. Ó Loideáin. See Lydon and Liddane. |
| Ó Loideáin | rare: Galway etc. Ir.Lang. See Lydon. |
| Ó Loideáin | Lydon, Leydon, Liddane: líonmhar: Connacht, Tuathmhumhain. Bhí na leagain Ó Lodáin agus Ó Lotáin ann roimhe seo. Ní fios cén bun-ainm a bhí ann. |
Parishes where Leyden and a second surname are both baptised.
This list shows total Leyden Roman Catholic baptisms by county.
Click on the county to see detail.