Clancy
An Irish surname meaning “descendant of the red-haired one” or “son of Flannchaidh,” long associated with a learned Gaelic family.
The #2,871 most common surname in the United States (2010 Census) — about 1 in every 24,589 Americans shares it.
Etymology
Clancy is an Anglicized Irish surname, commonly linked with the Gaelic form Mac Flannchaidh. The personal name Flannchaidh is usually explained from flann, meaning “red” or “ruddy,” with the name referring to a red-haired or red-complexioned ancestor. Older sources also connect the family with forms such as MacClancy and Clanchy, reflecting shifting spellings in Anglicized Irish.
History
The name is historically associated with a Gaelic sept in the Dal-Cassian tradition of Munster, where one branch is said to have served as hereditary judges under the O’Briens. Another family of the name was settled in Leitrim and held land in the north-west of Ireland. In modern usage, Clancy remains a familiar Irish surname in Ireland and among the Irish diaspora.
Origin
Regions
Variant spellings
Fun fact
Older writers sometimes glossed the name as a reference to a “red” or “ruddy” ancestor, which fits the Gaelic root flann.
From the historical record
“CHRISTMASDAY See Christmas. CLANCY. An Irish clan tributary to the O'Brian. D'Alton. CLANCH Y. " A sept of the Dal-Cassian stock, hereditary hrehvis or judges of Tho- moud, under the 0"Eryans, its princes ; while another familj^ of the name were lords of Dartry and Ilosclogher,in Leitrim." D'Alton. CLEAN.…”
— Patronymica Britannica: a dictionary of the family names of the United Kingdom