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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. |
| Liddane | rare: W Clare etc. Ir. Ó Loideáin. Variant of Lydon, q.v. |
| Ludden | fairly rare: Galway-Mayo-Donegal etc. Ir. Ó Loideáin, a variant of Lydon, q.v. |
| Lydon | numerous: Galway-Mayo-Sligo etc. Ir. Ó Loideáin (earlier Ó Lodáin). A name centred in Galway, it occurs as Leyden, Liddane and Ludden. MIF. |
Parishes where Ladden and a second surname are both baptised.
This list shows total Ladden Roman Catholic baptisms by county.
Click on the county to see detail.