The surname O’Connor is the anglicised form of the Irish Ó Conchobhair — meaning “descendant of Conchobhar — ‘lover of hounds’”. Derived from the Irish personal name Conchobhar (pronounced ‘KRU-hur’ or ‘KUN-or’), usually interpreted as ‘lover of hounds’ or ‘patron of wolves’.[1]
Quick Facts
| Irish form | Ó Conchobhair |
| Modern Irish | Ó Conchúir |
| Meaning | Descendant of conchobhar — ‘lover of hounds’ |
| Origin | Royal patronymic — the last High Kings of Ireland |
| Historical regions | Roscommon (Connacht), Offaly, Kerry, Derry — four distinct royal septs |
| Modern rank | Top 15 most common surnames in Ireland |
| Pronunciation | oh-KON-er (English) · OH KON-uh-khur (Irish) |
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Meaning & Etymology
Derived from the Irish personal name Conchobhar (pronounced ‘KRU-hur’ or ‘KUN-or’), usually interpreted as ‘lover of hounds’ or ‘patron of wolves’.[1]
One of the most historically significant Irish royal names — the O’Connors produced the last two High Kings of Ireland before the Norman invasion.[2]
Multiple distinct septs share the name, the most prominent being the O’Connors of Connacht.
Historical O’Connor Septs
There is rarely a single family behind a major Irish surname. Edward MacLysaght — the gold-standard source for Irish surname history — identifies distinct historical septs that all anglicised to O’Connor, often with no kinship to one another.[2]
O’Connor Don (Connacht)
The senior line — the Ó Conchobhair of Connacht — produced the two last High Kings of Ireland: Toirdhealbhach (Turlough, d. 1156) and his son Ruaidhrí (Rory, d. 1198). Their capital was at Rathcroghan in County Roscommon. The O’Connor Don (literally ‘the brown O’Connor’) is still a recognised Gaelic title, held by a living descendant of the royal line.[1][2]
O’Connor Faly (Offaly)
A separate royal sept held the Kingdom of Uí Failghe — modern County Offaly took its name from this family. They were among the last Gaelic lords to hold out against the Tudor conquest and were finally dispossessed in the 16th century.[1][2]
O’Connor Kerry
A distinct Munster sept held the territory of Iraghticonnor in north Kerry, around Listowel and Ballybunion. They are unrelated to the Connacht royal line.[1][2]
O’Connor of Corcomroe (Clare)
A fourth small sept held territory in north Clare and built the Cistercian Corcomroe Abbey in the Burren.[1][2]
Famous Bearers
- Rory O’Connor (Ruaidhrí Ó Conchobhair, c. 1116-1198) — the last High King of Ireland, reigned during the Norman invasion of 1169-70.
- Sinéad O’Connor — Dublin-born singer and cultural provocateur, among the most distinctive Irish musical voices of her generation.
- Flannery O’Connor — American writer of the Southern Gothic tradition (Wise Blood, A Good Man Is Hard to Find); her Irish Catholic roots were central to her fiction.
- Frank O’Connor — Cork-born short story writer, one of Ireland’s greatest 20th-century prose stylists.
- Sandra Day O’Connor — first female justice of the US Supreme Court; American descendant of Irish O’Connors.
Spelling Variants & Anglicisations
Over centuries of anglicisation, translation, and emigration, the O’Connor name has taken many forms in English and Irish:
- O’Connor · OConnor · O’Conner · O’Conor
- Connor · Conner (American anglicisations)
- Ó Conchobhair (historical Irish)
- Ó Conchúir (modern Irish)
Where to Visit if Your Name is O’Connor
If you carry the O’Connor name and want to walk the ground your ancestors once held, here are the regions of Ireland that are your strongest historical anchors:
- County Roscommon — the ancestral seat of the O’Connor royal line. Visit Rathcroghan — the ancient Connacht royal centre — and Tulsk, where the last inauguration of an O’Connor King of Connacht took place.
- County Offaly — named for the O’Connor Faly kings. Visit Clonmacnoise, the great monastic settlement on the Shannon, founded under O’Connor patronage.
- North Kerry — the Iraghticonnor country. Visit Listowel (home of writer John B. Keane), Ballybunion, and Carrigafoyle Castle.
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Sources
- Wikipedia: Wikipedia (en) — consolidated etymology and modern rank [link]
- Maclysaght: MacLysaght, Edward. Irish Families: Their Names, Arms and Origins. 1957, Hodges Figgis. The standard scholarly reference on the origin and distribution of Irish surnames.
All facts above are sourced from the named references listed above. Page last verified April 2026.