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| Gregan | Quite numerous: S E Leinster. Ir. Mag Riagáin, Riagán is a personal name. It appears in the more numerous O'Regan, q.v. SI. |
| Mag Riagáin | Gregan: líon beag: Oir-dheisceart. |
Parishes where a Gregan and a second surname married each other.
This list shows total Gregan Roman Catholic marriages by county.
Click on the county to see detail.