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| Donagh | rare: Meath. See MacDonagh. |
| Mac Donnchadha | Mac Donagh, Donaghy, Dennison & rl: líonmhar ar fud na tíre, i gConnachta ach go h-áirithe. Craobhacha de chlanna Mhic Dhiarmada agus Uí Fhlaithearta. Bíonn Dennison orthu i Luimneach agus Donaghy in Ultaibh. An litriú nua: Mac Donncha. IF & SGG. |
| MacDonagh | Very numerous: all areas, especially Connacht. Ir. Mac Donnchadha from first name Donnchadh, brown warrior. Modern Donncha. A branch of the Mac Dermots in Connacht. There is a Scottish connection as Donncha = Duncan. SGG. |
| MacDonncha | Quite numerous: Conamara etc. Ir. Lang. See Mac Donagh. One of the few Ir. Lang. names to re-assert itself in the telephone directory. |
| MacDonough | numerous: all areas, mainly Dublin. See Mac Donagh. |
Parishes where a Donagh and a second surname married each other.