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| Mac Niallghuis | Mac Nelis: líon beag: Tír Chonaill. Bhí an chlann i nGleann Cholm Cille tráth. Táid le fáil i gConnachta faoin mbréagriocht Mag Riallais, q.v. Fréamh: Niall + gus (fuinneamh). Litriú nua: Mac Niallais. |
| MacNelis | Quite numerous: Donegal etc. Ir. Mac Niallghuis, from first name Niall + gus (vigour). It has always been associated with Donegal. Mod. Mac Niallais.MIF. |
| Nealis | Very rare: scattered. See Nelis. |
| Nelis | Quite numerous: Derry etc. See Mac Nelis. |
| Nellis | rare: Belfast etc. See Nelis & Mac Nelis. Ir. Mac Niallghuis, -Niallais. |
Parishes where Nillis and a second surname are both baptised.
This list shows total Nillis Roman Catholic baptisms by county.
Click on the county to see detail.