Tandragee Castle sits on a ridge above the River Cusher in County Armagh, and for centuries before its stone walls took their current shape, this ground belonged to the O'Hanlon lords of Orior. It was in this same barony, the historic barony of Orior in eastern County Armagh, that the O'Hare family is recorded as an Oriel sept in its own right. The castle was seized during the Plantation of Ulster, burned during the 1641 rebellion, and left in ruins for two hundred years — a fate the O'Hares' own homeland shared, even though no O'Hare castle survives to tell the story directly.
Quick answer: O'Hare is the anglicized form of the Gaelic Ó hÍr, meaning "descendant of Ír." According to Patrick Woulfe's Irish Names and Surnames, the O'Hares were an Oriel family from the barony of Orior in eastern County Armagh, closely related to the Ó hAnluain (O'Hanlon) sept who ruled that territory as part of the ancient kingdom of Airgíalla, also spelled Oriel.
What Does the O'Hare Name Mean?
The scholarly consensus, drawn from Woulfe's 1923 reference work, traces O'Hare to Ó hÍr, "descendant of Ír." Some later sources render the Gaelic form as Ó hAichir, and a handful of popular genealogy sites conflate O'Hare with the unrelated Munster surname Ó hOichir of County Clare. Woulfe himself warned against this exact mix-up, noting that the Armagh family "must be distinguished from Ó hOichir of Thomond, which is similarly anglicised." The safest, most consistently cited form remains Ó hÍr.
Anglicized spellings recorded historically include O Hier, O Hire, O Heere, O'Hear, O'Haire, and simply Hare or Haire. The apostrophe form O'Hare is now the standard spelling, though variant branches of the same Gaelic name still appear under Hare and Haire in parish and census records from Ulster.
Like most early Irish surnames, Ó hÍr was formed by fixing an ancestor's personal name behind the prefix Ó, meaning "grandson of" or, more loosely, "descendant of." Ír himself left no independent trace in the surviving Oriel genealogies, which is ordinary for the individuals behind these names; surnames fixed in the tenth and eleventh centuries typically preserve the ancestor's name long after every other record of him has disappeared.
Where Was the O'Hare Homeland in County Armagh?
Woulfe places the O'Hares specifically as an Oriel family "akin to that of Ó hAnluain," the O'Hanlons, who were chiefs of Oirthear — the barony that survives today as Orior, in the east of County Armagh. Orior corresponds closely to the Airthir, one of the constituent territories of the medieval kingdom of Airgíalla, a Gaelic overkingdom that once stretched across Armagh, Monaghan, and neighboring counties before it was broken up into shire counties under the English crown.
The O'Hanlons held the standing of hereditary chiefs in Orior, ranking among the more powerful lords of Oriel, while the O'Hares appear in the genealogical record as a related, lesser family sharing that same territory. This places the O'Hare name firmly within the Gaelic order of eastern Armagh in the centuries before English administration reorganized the county into its modern parishes and townlands.
Orior should not be confused with the neighboring barony of the Fews, immediately to the south, which was the seat of a separate line of the O'Neills, the O'Neills of the Fews, rather than the O'Hanlon-led territory where the O'Hares are documented. Armagh's Gaelic lordships sat close together, and the two baronies bordered and interacted with each other constantly, but the historical record ties the O'Hare sept specifically to Orior and the O'Hanlon lordship, not to the Fews.
The wider kingdom of Airgíalla, of which Orior was one part, had already begun to dissolve by the late sixteenth century. In 1585 its ruling family surrendered its territory to the English crown under the policy of surrender and regrant, and much of Oriel was reorganized into County Monaghan, while Orior remained inside County Armagh as one of its baronies. That administrative shift, decades before the wider Plantation of Ulster, was the first step in converting a Gaelic lordship into the county and barony system genealogists still use to locate families like the O'Hares today.
Families researching this line today often want something tangible to mark it. A few pieces built around the O'Hare name and the Irish national tartan carry that history into daily use, among them an O'Hare heritage mug, an O'Hare garden flag, and an O'Hare ceramic ornament.
We've gathered our O'Hare family crest gifts — mugs, garden flags, woven blankets, and more — in one place: the O'Hare Irish Family Gifts & Heritage collection.
What Happened to the O'Hares During the Plantation of Ulster?
Orior did not escape the upheaval of the early seventeenth century. Tandragee Castle, the O'Hanlon stronghold at the heart of the barony, was granted to Sir Oliver St. John, an English Lord Deputy of Ireland, who rebuilt it as a fortified house around 1610. The native lordship that had anchored the O'Hanlons, and by extension the smaller families bound to them, was dismantled along with it.
The dispossession did not go unanswered. When the 1641 rebellion broke out, the O'Hanlons attempted to retake their lands, and the fighting left Tandragee Castle a ruin for the next two hundred years; it was not rebuilt until 1837. That two-century gap, castle standing empty on ground that had been O'Hanlon and O'Hare territory alike, is as good a marker as any of how completely the plantation era severed Orior's Gaelic families from the land they had held.
Why Did the O'Hares Keep Their Irish "Ó"?
Most Gaelic-Irish surnames quietly dropped the O' or Mac prefix over the seventeenth and eighteenth centuries, as English became the language of law, land, and commerce in Ulster. O'Hare was one of a smaller number of Armagh names, alongside O'Hehir, that held onto the prefix through this period rather than anglicizing it away entirely, even as many neighboring families simplified to Hare or Haire without it. That consistency is part of what makes the surname's documentary trail, from Woulfe's genealogical entry through parish registers into modern census records, easier to follow than for names that shed the O' and picked it back up again during the Gaelic Revival of the late 1800s.
This is also where the record shows the clearest difference between the O'Hares and their O'Hanlon neighbors. The O'Hanlons, as the ruling lords of Orior, lost land and title outright with the fall of the lordship, and their story after 1610 is largely a story of dispossession from a named seat, Tandragee. The O'Hares, never having held that same lordly rank, are harder to track through a single castle or estate; their history survives instead in the surname itself, carried by tenant families through parish registers, Griffith's Valuation records from the 1850s and 1860s, and the census returns that followed, rather than through a single dramatic seizure of land.
Where Do O'Hares Live Today?
The O'Hare name remains concentrated in Ulster, most visibly in County Armagh and the neighboring counties of Antrim and Down, tracing a fairly direct line back to the Orior homeland. From there, like most Ulster surnames, it spread through nineteenth and twentieth century emigration to Britain, the United States, Canada, and Australia, where it survives today both as O'Hare and in the older anglicized forms Hare and Haire.
Because Armagh sat close to Belfast's industrial economy and its Atlantic-facing ports, O'Hare families left records across multiple waves of departure rather than a single defining famine-era exodus, which is part of why the name today reads as a broadly Ulster-Irish surname rather than one tied to a single emigrant generation.
Researchers tracing an O'Hare line back to Armagh generally work through the same layered records that document Orior more broadly: Griffith's Valuation for mid-nineteenth-century tenants, the surviving 1901 and 1911 census returns, and parish baptismal and marriage registers for the townlands within Orior. None of these sources are unique to the O'Hare name, but taken together they are what allows a modern O'Hare family to connect a documented nineteenth-century ancestor back to the same barony Woulfe identified as the sept's historical home.
Frequently Asked Questions About the O'Hare Name
Is O'Hare an Irish surname?
Yes. O'Hare is the anglicized form of the Gaelic Ó hÍr, documented by Patrick Woulfe as an Oriel family from the barony of Orior in eastern County Armagh.
What does O'Hare mean in Irish?
Following Woulfe's Irish Names and Surnames, it means "descendant of Ír." Ír himself is not otherwise documented in the surviving genealogies, which is typical for early Gaelic personal names behind Irish surnames.
Is O'Hare related to O'Hara?
No. O'Hara descends from a separate Sligo-based sept, Ó hEaghra. The two names look similar in English but come from unrelated Gaelic roots and different parts of Ireland.
Is O'Hare the same as O'Hehir?
They are related in spelling history rather than descent. Woulfe specifically distinguishes the Armagh O'Hares (Ó hÍr) from Ó hOichir of Thomond in County Clare, a separate Munster family whose name anglicizes in a similar way.
Where in Ireland did the O'Hare family come from?
County Armagh, specifically the barony of Orior in the east of the county, within the historic Gaelic territory of Airgíalla, also known as Oriel.
Sources and further reading
Patrick Woulfe, "Ó hÍr," Irish Names and Surnames (1923), reproduced at Library Ireland