The Irish surname McLarnon, also found in Scotland, is an anglicized form of the Gaelic name Mac Giolla Earnáin meaning “son of the servant or devotee of St. Earnan.” St. Earnan was a 7th Century monk whose monastery was in county Donegal in northern Ireland where most bearers of the name McLarnon are still found to this day. Today the name is most frequently found in county Antrim with a number of families scattered in Scotland also. The Coat of Arms is a heart pierced with three nails, and although the specific meaning is unknown it is undoubtedly a religious reference to the crucifixion and to the original bearer of the name Saint Earnan.
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