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| Killian | Quite numerous: Athlone area-Galway, Longford-Meath. Ir. Ó Cilleáin. See Killeen. |
| Killion | rare: Athlone area etc. See Killeen. |
Parishes where Killian and a second surname are both baptised.
This list shows total Killian Roman Catholic baptisms by county.
Click on the county to see detail.