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| Dennison | fairly numerous: E Ulster and scattered. As Dennis, also Mac Donnchadha, certainly in W Limerick. SI. |
| 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. |
Parishes where Dennesson and a second surname are both baptised.