Clan Rising

O'Connor

also O'Conor, Ó Conchobhair, Connor

The royal house of Connacht, the last high kings of Ireland.

Origin
Connacht, Ireland
Motto
Ó Dia gach an cabhair
Famous bearer
Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland
Register
Irish family
Territory of O'Connor

CoreHistoric reach

The seat of O'Connor

Seat vacant

Chief

No one leads the O'Connor community yet. When the movement opens, you can stand for its leadership, or help elect whoever does.

Current mission

No shared goal set yet. Once O'Connor has leadership, it sets the public focus: a restoration, a gathering, a real-world project that helps its own.

The O'Connor clan is being rebuilt. Join the waiting list for the movement today, and you help decide who leads it and what it does.

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Motto

Ó Dia gach an cabhair

All help is from God

What does the O'Connor name mean?

From Ó Conchobhair, descendant of Conchobhar. Conchobhar means 'lover of hounds' (con, hound + cobhar, desire). The principal Conchobhar of the surname was Conchobhar mac Tairdelbach (d. 1067), king of Connacht, whose grandson Tairdelbach Mór Ó Conchobhair (1088–1156) was high king of Ireland. The Connacht O'Conors of Roscommon are the line; lesser Ó Conchobhair kindreds gave rise to the O'Connors of Kerry, Offaly (Uí Failí), and Sligo.

The history of O'Connor

The Ó Conchobhair of Connacht were the last Gaelic high kings of Ireland. Tairdelbach Ó Conchobhair was high king from 1119 to 1156 and his son Ruaidrí from 1166 to 1186. Ruaidrí was the high king who failed to prevent the Anglo-Norman conquest of Leinster, Strongbow landed in 1170 against the background of Ruaidrí's quarrel with Diarmait Mac Murchadha, and he submitted to Henry II at the Treaty of Windsor in 1175. He retired to the Augustinian abbey at Cong in Mayo and died there in 1198. He is buried at Clonmacnoise.

The senior O'Conor Don line continued to rule a much-reduced kingdom of Connacht under Norman supervision until the Cromwellian confiscations of 1652. The current O'Conor Don, Desmond O'Conor (b. 1938), is the of three recognised O'Conor cadet branches and the only Gaelic dynastic head whose title is acknowledged in continuous male-line descent from a high king of Ireland.

Sandra Day O'Connor (1930–2023), the first woman appointed to the United States Supreme Court, descended from a Texas-O'Connor line of Famine-era Irish emigration. Sinéad O'Connor (1966–2023), the singer; Carroll O'Connor (1924–2001), the American actor; Frank O'Connor (1903–1966), the Cork short-story writer, all from the same Connacht-O'Connor surname pool. Roscommon today is still the densest O'Connor county on the island.

Champions of the O'Connor name

The bearers whose lives are inseparable from this surname. Each has its own page — biography, achievements, geography, connection to the family.

Step Into History

Walk the streets and seats the O'Connor name knew — a photoreal walk through time, on foot.

Notable bearers of the O'Connor name

  • Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland
  • Tairdelbach Mór Ó Conchobhair (1088–1156), high king, builder of churches at Tuam and Clonfert
  • Sandra Day O'Connor (1930–2023), first woman justice of the US Supreme Court
  • Sinéad O'Connor (1966–2023), singer
  • Rory O'Connor (1883–1922), anti-Treaty IRA Director of Engineering, executed 1922

Stories of O'Connor

Frequently asked

What does the surname O'Connor mean?

From Ó Conchobhair, descendant of Conchobhar. Conchobhar means 'lover of hounds' (con, hound + cobhar, desire). The principal Conchobhar of the surname was Conchobhar mac Tairdelbach (d. 1067), king of Connacht, whose grandson Tairdelbach Mór Ó Conchobhair (1088–1156) was high king of Ireland. The Connacht O'Conors of Roscommon are the line; lesser Ó Conchobhair kindreds gave rise to the O'Connors of Kerry, Offaly (Uí Failí), and Sligo. The Ó Conchobhair of Connacht were the last Gaelic high kings of Ireland.

Where does the O'Connor family come from?

The O'Connor family is rooted in Connacht, in Ireland. Within that, the name was particularly concentrated in Roscommon. The atlas page for the name records the historical territory it has held over the centuries.

Where did the O'Connor family historically hold territory?

At its greatest historical extent, the O'Connor name has been concentrated in Galway, Sligo, Mayo, Kerry and Offaly. The atlas page distinguishes the core territory of the name from this wider historical reach with hatched silhouettes on the map.

Is O'Connor a Ireland surname?

Yes, O'Connor is a Ireland surname. Its editorial home in this atlas is Ireland, where the historical territory and family record of the name are concentrated.

How old is the O'Connor surname?

The Ó Conchobhair of Connacht were the last Gaelic high kings of Ireland. European hereditary surnames crystallised broadly between the 12th and 14th centuries, and the O'Connor name took its modern form within that long settlement.

What is the O'Connor family known for?

The royal house of Connacht, the last high kings of Ireland. The Ó Conchobhair of Connacht were the last Gaelic high kings of Ireland.

What is the O'Connor motto?

The motto of the O'Connor family is "Ó Dia gach an cabhair", which translates as "All help is from God". Family mottoes were registered with the chief of the name and carried on the heraldic arms and battle-banners.

What does "Ó Dia gach an cabhair" mean in English?

"Ó Dia gach an cabhair" is the motto of the O'Connor family. In English it means "All help is from God". The phrase is typically rendered in Latin, though some Highland families carry their motto in Gaelic and some Norman lines in Old French.

Who is the most famous O'Connor?

The best-known bearer of the O'Connor name is Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland. Other prominent figures of the family include Tairdelbach Mór Ó Conchobhair (1088–1156), high king, builder of churches at Tuam and Clonfert, Sandra Day O'Connor (1930–2023), first woman justice of the US Supreme Court and Sinéad O'Connor (1966–2023), singer.

Who are some famous O'Connors?

Notable bearers of the O'Connor name include Ruaidrí Ó Conchobhair (1116–1198), last high king of Ireland, Tairdelbach Mór Ó Conchobhair (1088–1156), high king, builder of churches at Tuam and Clonfert, Sandra Day O'Connor (1930–2023), first woman justice of the US Supreme Court, Sinéad O'Connor (1966–2023), singer and Rory O'Connor (1883–1922), anti-Treaty IRA Director of Engineering, executed 1922. Each is profiled on the family page, with cross-links to the geography, stories, and historical events tied to their life.

What stories are told about the O'Connor family?

The O'Connor family is associated with Rory O'Connor at the Four Courts. Each story has its own page on this site with the full account, the date, the location, and the other families involved.

What is the story of Rory O'Connor at the Four Courts?

From the fourteenth of April to the thirtieth of June 1922, in the Four Courts complex on the north bank of the Liffey in central Dublin, an anti-Treaty IRA garrison of about a hundred and eighty men under Rory O'Connor, thirty-nine years old, the anti-Treaty IRA Director of Engineering and one of the anti-Treaty figures, occupied the Four Courts as a political statement against the Anglo-Irish Treaty signed by Michael Collins and Arthur Griffith in December 1921. The Provisional Government of Ireland under W. The event is dated to 1922.

Is O'Conor the same family as O'Connor?

Yes. O'Conor is a historical spelling variant of the O'Connor name. The two share the same lineage and family affiliation; different parishes, clerks and migration registrars recorded the same name in slightly different forms, and the variant spellings sit on the same family tree.

Is Ó Conchobhair the same family as O'Connor?

Yes. Ó Conchobhair is a historical spelling variant of the O'Connor name. The two share the same lineage and family affiliation; different parishes, clerks and migration registrars recorded the same name in slightly different forms, and the variant spellings sit on the same family tree.

Is Connor the same family as O'Connor?

Yes. Connor is a historical spelling variant of the O'Connor name. The two share the same lineage and family affiliation; different parishes, clerks and migration registrars recorded the same name in slightly different forms, and the variant spellings sit on the same family tree.

Where is the O'Connor surname found today?

Ireland is the primary historical home of the O'Connor surname. In the modern era, the name is also borne across the wider diaspora, particularly in the United States, Canada, Australia and New Zealand, where families carry the line of descent from the same Ireland origin recorded on this page.

What does the Clan Rising page for the O'Connor family cover?

The Clan Rising page for the O'Connor family covers the meaning of the surname, the historical geography of the name, the family motto, famous bearers of the name, traditional stories and the seat of the head of the family. Each section is linked to the underlying atlas of Ireland so the name can be read in the geography that shaped it.

Who is the head of the O'Connor family today?

The seat for the head of the O'Connor family is currently vacant on this register. Clan Rising is rebuilding the chief and family structure for the modern era, and the family page allows readers to claim the seat or pledge to the name.

Neighbouring clans