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Before this Y-DNA project was established, it was already known that the Irish surname Clancy, originally MacClancy and in Irish Mac Fhlannchaidh or Mac Fhlannchadha, had at least two separate origins. One sept, in Thomond (now County Clare), were hereditary brehons to the O'Briens. The other was of Rosclogher in County Leitrim.
The Thomond sept has given its name to three townlands in County Clare:
The best account of the Leitrim sept is Historical notes on the ancient sept of Clancy, Glancy (MacFhlannchadha) of Dartry, compiled by Maria Clancy (Dublin: Linden Publishing Services, 2007) (ISBN: 9781905487080).
Early DNA results have shown that the Clancy surname actually has at least six different genetic origins.
The name has spread from Clare and Leitrim throughout Ireland and abroad. The 1911 census of Ireland included 3,632 Clancys, 653 of them born in County Clare and 573 in County Leitrim.
The Thomond sept has given its name to three townlands in County Clare:
- Ardmaclancy in Kilfinaghta civil parish;
- Caherclanchy in Dysert civil parish; and
- Cahermaclanchy in Killilagh civil parish.
The best account of the Leitrim sept is Historical notes on the ancient sept of Clancy, Glancy (MacFhlannchadha) of Dartry, compiled by Maria Clancy (Dublin: Linden Publishing Services, 2007) (ISBN: 9781905487080).
Early DNA results have shown that the Clancy surname actually has at least six different genetic origins.
The name has spread from Clare and Leitrim throughout Ireland and abroad. The 1911 census of Ireland included 3,632 Clancys, 653 of them born in County Clare and 573 in County Leitrim.