From Mac Diarmada, ‘son of Diarmaid’ — princes of Moylurg who ruled from an island stronghold in Lough Key.
The Mcdermott certificate.
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Gaelic Origin · Root meaning ‘son of Diarmaid’
McDermott descends from Diarmaid Mac Diarmada, an eleventh-century lord of the Uí Briúin Aí, whose descendants ruled the territory of Moylurg from a stronghold on an island in Lough Key, County Roscommon, for some six hundred years.
Long after the kingdom of Connacht passed to others, the head of the family kept the courtesy title ‘The MacDermot, Prince of Coolavin’ — a crown that outlasted the throne it once answered to.
Irish form: Mac Diarmada
