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| Killalea | rare: Connacht. See Killilea. |
| Killally | Very rare: Offaly. See Killilea. |
| Killilea | Quite numerous: Galway-Mayo-Roscommon etc. Ir. Mac Giolla Léith (grey servant).MIF. |
| Killyleagh | Very rare: Belfast area. Possibly from placename near Belfast; more likely a variant of Killilea, q.v. |
| Mac Giolla Léith | Killilea: líon beag: Gaillimh-Maigh Eo-Ros Comáin. Bhí siad i nGaillimh sa 16 céad. Fréamh: ón dath liath, de réir de Bhulbh. MIF. |
Parishes where Killalea and a second surname are both baptised.