| 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. |
| Mac Donnagáin | Donnegan: féach Ó Donnagáin. Bhain an chlann sa le Contae an Dúin. D'fhéadfadh Dungan nó fiú Cunningham bheith orthu. |
| Ó Donnacháin | Doonican, Duncan: fíor-annamh: Lár na Tíre. Ar aon dul le Ó Donnagáin, is cosúil. Clann airchinneach i bhFear Manach, tráth. SI. |
Parishes where Doonican and a second surname are found together
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