Irish surname "O hEarcain," which is derived from the word "earc," meaning "red." Thus, the surname would have originally been born by a "descendant of Red."
where members of the family were erenaghs of Clonska, a parish near Malin Head. They are mentioned as such in Bishop Montgomery's diocesan survey of 1606. Danieal O'Harcan died in 1581 as a Catholic martyr in Ulster.
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