| Gaelic form | Ó hEaghra |
| Meaning | Descendant of Eaghra |
| Etymology | eaghra — a personal name, possibly from ear (sharp, keen) |
| Province | Connacht (primary) |
| Core counties | Sligo (primary), Mayo, Roscommon |
| Rank in Ireland | Common — one of the chief Connacht surnames |
| Variant spellings | Hara, O'Hara, Ohara, O'Harra |
O'Hara — in Irish, Ó hEaghra — is one of the principal surnames of County Sligo and the broader Connacht province. The name derives from a personal name, Eaghra, whose exact meaning is uncertain but may relate to the Old Irish ear, meaning sharp or keen. Eaghra was a 10th-century ancestor from whom the sept traces its descent.
The O'Haras were lords of Leyny, a territory in the north of County Sligo, for centuries before the Tudor conquest. They were a powerful family within the complex of Connacht nobility, allied at various times with the O'Connors (the provincial kings) and the McDonaghs.
The name gained international recognition through literature — most famously through the fictional Scarlett O'Hara of Margaret Mitchell's Gone with the Wind, whose name was chosen by Mitchell to signal Irish-American Catholic ancestry. This reflected the reality of the American South: the Famine Irish who settled in the cities and on the plantations of the South were a significant demographic presence.
Leyny barony in County Sligo was O'Hara territory. The family held lands around Collooney, Ballymote, and the eastern Sligo countryside. The O'Hara castle at Collooney stood as their principal stronghold. Sligo today remains the county with the highest concentration of Hara and O'Hara families.
Like many Connacht families, the O'Haras spread into adjacent counties — south into Roscommon and east into Leitrim. The Mayo O'Haras are a separate branch. The family name is found throughout Connacht but thins considerably as you move into Munster or Leinster.
The O'Haras held their Sligo territory for centuries as one of the secondary nobility of Connacht. They were subordinate to the O'Connors as provincial kings but maintained independent lordship of their own district. The Annals of the Four Masters, the great chronicle of Gaelic Ireland compiled in the 17th century, records O'Hara lords throughout the medieval period.
Like most Connacht nobility, the O'Haras were caught between allegiances during the Nine Years' War (1593–1603). Some supported Hugh O'Neill's rebellion against English rule; others sought accommodation with the Crown. The war's end and the Flight of the Earls in 1607 broke the Gaelic order of which the O'Haras were part.
Charles O'Hara (1746–1822) is the best-documented O'Hara of the post-Gaelic period — an Anglo-Irish parliamentarian who represents the transition of the family from Gaelic lords to Protestant gentry. His papers, held at Trinity College Dublin, document the O'Hara estate at Annaghmore, Sligo, in the 18th century.
The Famine scattered Sligo's population across the Atlantic. The Sligo-New York emigration route was one of the most heavily trafficked in the Famine years: ships leaving Sligo harbour carried emigrants directly across the Atlantic, while others went via Liverpool to New York. By 1860, there were large O'Hara communities in New York City, particularly in the Five Points district and later in Hell's Kitchen.
In the American South, the O'Hara name has antebellum roots. Irish Catholic workers were brought to New Orleans, Savannah, and other Southern ports for construction and dockwork — considered too expendable even for the work assigned to enslaved people. These early Irish communities in the South formed the backdrop for Mitchell's fictional character.
Canada also received substantial Sligo emigration. The timber trade ships that carried lumber from Quebec to Ireland returned with emigrants, creating a Connacht diaspora across Quebec, Ontario, and the Maritime provinces.
The Sligo, Boyle, and Ballymote registration districts cover O'Hara territory. Search at IrishGenealogy.ie.
Sligo's Catholic registers are among the better-preserved in Connacht. Parishes of Achonry, Kilvarnet, and Ballysadare cover the O'Hara heartland.
The Irish and Local Studies department at Sligo County Library holds extensive genealogical records including gravestone inscriptions, estate records, and indexed civil registration data for Sligo.
For researchers with O'Hara ancestors who may have been gentry rather than tenant farmers, the O'Hara papers at Trinity College Dublin and the National Library document the Protestant O'Hara family of Annaghmore from the 18th century.
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