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| Mac Giolla Earnáin | Mac Larnon: líonmhar: Cúige Uladh. Bhí siad sa Dún sa 12 céad agus tá a gcomh-shloinne in Albain; b'fhéidir gur de bhunadh Albanach cuid des na h-Ultaigh seo. Fréamh: díspeagadh ar Earna, b'fhéidir, ach ceapann Ó Corráin & Maguire go bhfuil nasc le iarann (an miotal). GPN. |
| MacClarnon | rare: Belfast-Antrim. Ir. Mac Giolla Earnáin, devotee of St Earnán. A sept of Down in 12 cent. SGG. |
| MacLarnon | numerous: Ulster generally. Ir. Mac Giolla Earnáin, devotee of St Earnán. A sept of Down but also occurring in Scotland.MIF. |
| MacLernon | numerous: N Antrim-E Derry-E Tyrone. Ir. Mac Giolla Earnáin, the first name Earnán means, perhaps, "little iron one". A sept of Down but also Scottish which may account for this group. SS. |
Parishes where McLarnon and a second surname are both baptised.