(pg. 118) Hegarty: "In Irish the Surname is O hEigceartaigh, from eigceartach, meaning unjust'. The name appears to have arisen first in the area now divided between counties Derry and Donegal, where the O hEigceartaigh were a branch of the Cinel Eoghaain, that large group of families calming descent from Eoghan, one of the sons of Niall of the Nine Hostages, the fifth-century monarch who supposedly kidnapped St Patrick to Ireland. However, today the surname is much more common in Co. Cork (O') Hegartys were claimed as a branch of the more historically prominent northern family, but ecertach was a common personal name in Munster, and it seems more likely that the surname arose separately there. At any rate, O'Hegartys are recorded in west Cork as early as the thirteenth century, and remain strongly associated with the area."
(Pg. 142) " (O) Haggerty a variant of Hegarty" (pg. 153) "O Hegarty O hEigceartaigh (eigceartach, unjust). Primarily an Ulster sept. There was also one of the same name in Munster, a branch of the Eoghanacht."
(Co. Derry Tartan as background)
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