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| Donaghan | Very rare: Monaghan. Ir. ? Ó Donnacháin. |
| Donegan | numerous: Midlands, Munster, S W Ulster. Ir. Ó Donnagáin. Relates to a number of separate septs: Cork, W Meath, Monaghan etc. See also Dungan.MIF. |
| Doonigan | Very rare: Midlands. See Dunican. |
| Dunican | fairly rare: Midlands etc. See Donegan. |
| Dunigan | Very rare: Antrim. See also Donegan. |
Parishes where O'Donegan and a second surname are both baptised.
This list shows total O'Donegan Roman Catholic baptisms by county.
Click on the county to see detail.