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| Costin | Very rare: Waterford & Cork. Ir. Mac Oistín (Austin). The Norse form of Augustine. |
| Mac Oistín | Costin: fíor-annamh: Port Lairge. Leagan Lochlannach ar Augustin. |
Parishes where Coston and a second surname are both baptised.
This list shows total Coston Roman Catholic baptisms by county.
Click on the county to see detail.