Ó Conchobhair
Connacht's royal name — the last High Kings of Ireland were O'Connors
O'Connor is the anglicised form of Ó Conchobhair, one of the great royal surnames of Ireland. The O'Connors of Connacht furnished the last true High Kings of Ireland before the Norman invasion. The name is also found in Kerry (Ó Conchobhair Ciarraí) and Offaly and Clare, each a distinct dynasty with separate origins.
O'Connor — Ó Conchobhair in Gaelic — derives from the personal name Conchobhar, variously interpreted as "lover of hounds" (from cú, hound, and cobhar, desiring) or "high-will." The name was common across medieval Ireland, producing several unrelated dynasties. The most historically significant were the O'Connors of Connacht — the royal house of the province of Connacht for centuries — and the O'Connors of Kerry, an equally ancient but separately descended family.
The O'Connors of Connacht held the kingship of their province for generations. Turlough Mor O'Connor (1088–1156) rose to become High King of Ireland, and for a period exercised real authority over most of the island. He built Galway's first bridge, patronised the church, and conducted campaigns that demonstrated his ambition for national supremacy. His son Rory O'Connor (c.1116–1198) was the last High King of Ireland recognised across the island — his reign ended with the Treaty of Windsor (1175) with Henry II of England, which divided Ireland between the Norman lord and the Irish king, with Rory holding a diminished Connacht. Rory died in the abbey of Cong, County Mayo, in 1198, the last of the native High Kings.
The O'Connor Kerry family — Ó Conchobhair Ciarraí — were lords of northern Kerry around Tralee and the Castleisland area. A wholly separate lineage from the Connacht O'Connors, they trace descent from a different Conchobhar ancestor. They maintained their lordship in Kerry through the medieval period, clashing with the Anglo-Norman FitzMaurice (later FitzGerald) lords who dominated much of Munster. The Kerry O'Connors lost much of their land during the Elizabethan and Cromwellian land confiscations.
The Connacht O'Connors faced relentless pressure from the Composition of Connacht (1585) and the subsequent plantations. While some O'Connor branches survived as Catholic gentry into the seventeenth century — the O'Connors of Bellanagare in Roscommon were notable hereditary historians and poets — the Cromwellian period of the 1650s stripped many of their remaining landholdings. Charles O'Connor of Bellanagare (1710–1791) was a celebrated Irish historian and antiquary who worked to preserve Gaelic manuscripts and champion Catholic civil rights.
Roscommon, Kerry, and Clare were among the most devastated counties of the Great Famine. The O'Connor heartland in Connacht saw devastating mortality and emigration. Roscommon's population collapsed by over 30% between 1841 and 1851. O'Connors joined the great wave of Famine emigration to the United States, Australia, and Canada, establishing communities in cities from Boston to Melbourne.
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Search the Irish Surname Finder →The O'Connor diaspora is enormous. In the United States, the name is among the most common Irish surnames — concentrated in New York, Massachusetts, Illinois, California, and the wider Midwest. The Famine decades brought O'Connors from Roscommon and Kerry in particular numbers to the US northeast. The American politician Tip O'Neill (Thomas Philip O'Neill Jr.), Speaker of the House, descended from Kerry O'Connors — demonstrating the name's penetration into American public life.
Australia received substantial O'Connor emigration, particularly to Victoria and New South Wales. The name O'Connor appears in the early colonial record: Roderic O'Connor was one of the founders of Western Australia's colonial administration in the 1830s. Canada — particularly Ontario and Quebec — also holds large O'Connor communities descended from Famine-era and post-Famine emigrants from Connacht and Munster.
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