| Armagh: | 5 | Belfast city: | 1 | Carlow: | 1 | Cavan: | 17 |
| Down: | 2 | Dublin: | 17 | Dublin city: | 25 | Galway: | 2 |
| Kildare: | 4 | Laois: | 3 | Leitrim: | 2 | Louth: | 5 |
| Mayo: | 1 | Meath: | 8 | Monaghan: | 3 | Offaly: | 2 |
| Roscommon: | 17 | Sligo: | 1 | Waterford: | 3 | Westmeath: | 18 |
| Wicklow: | 1 |
| Degnan | rare: Antrim. See Deignan. |
| Deighnan | fairly rare: Connacht, Belfast area (Deignan). Ir. Ó Duibhgeannáin (dark head). See Duignan which relates to Roscommon. SGA gives Ó Duígeannáin as the modern version. |
| Dignam | fairly numerous: Dublin etc. See Duigenan. |
| Dignan | rare: scattered. See Duigenan. |
| Duignan | fairly numerous: Midlands, E Connacht. Ir. Ó Duibhgeannáin. Derivation possibly similar to Duffin. They were a noted literary family of Roscommon. SGG. |
| Ó Duibhgeannáin | Duignan (-m): cuíosach líonmhar: Lár na Tíre & oirthear Chonnacht. Clann liteartha i Ros Comáin & Liatroim a b'ea iad. Brí: dubh + ceann. MIF & SGG. |
Parishes where Dignam and a second surname are found together
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