There are many Irish surnames being used today that are almost indistingushiable from their ancient forms. McGrorty originally appeared in Gaelic as MacRobhartaigh," or "son of Robhartaigh," an old personal name derived from the Irish word "robharta" meaning "full tide."
The surname McGrorty was first found in County Donegal (Irish: Dún na nGall), northwest Ireland in the province of Ulster, sometimes referred to as County Tyrconnel, where they were the coarbs (hereditary lay lords) of the church of St. Columcille in Tory Island.
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