Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
FLAHERTY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Celtic.) A man of chieftain-like exploits. From flaith, a lord or chief, and oirbheartach, noble-deeded; the man of noble deeds.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic