Quick answer: Kennedy is an anglicized form of the Irish Ó Cinnéide, meaning “descendant of Cinnéidigh.” Patrick Woulfe records at least two distinct Irish families under this surname: an Ormond family that belonged to the Dál gCais, and a separate Uí Maine family in County Galway. These Ormond and Galway histories show the surname's breadth in Ireland.
If you are shopping rather than researching, browse our Kennedy Irish family gifts. For genealogy, the best starting point is the earliest proven Kennedy ancestor in your own family and the place where that person lived.
What Does the Kennedy Surname Mean?
Woulfe records the Irish forms Ó Cinnéide, Ó Cinnéididh and Ó Cinnéidigh, with English forms including O'Kennedy and Kennedy. The secure surname meaning is “descendant of Cinnéidigh.” Woulfe glosses the personal name Cinnéidigh as “helmeted-head,” an old personal-name meaning preserved in the surname.
The prefixed form O'Kennedy appears in historical and modern records, and it remains in use in north Tipperary: the Nenagh-born politician Michael O'Kennedy served as Ireland's Minister for Foreign Affairs from 1977 to 1979 and later as a European Commissioner.
Where Did the Irish Kennedy Families Come From?
The best-known Irish Ó Cinnéide family was an Ormond branch of the Dál gCais. Woulfe says this family was originally seated at Glenomra, corresponding with the parish of Killokennedy in east County Clare, before becoming established in Upper and Lower Ormond in County Tipperary. From the twelfth to the sixteenth century, its leading branches ranked among the lords of Ormond. Woulfe distinguishes three major branches there: Ó Cinnéide Fionn, Ó Cinnéide Donn and Ó Cinnéide Ruadh.
A second Kennedy family belonged to Connacht. Woulfe separately records an Ó Cinnéide family of Clann Cearnaigh, a branch of Uí Maine in County Galway. Clann Cearnaigh gives County Galway its own Kennedy tradition, distinct from the Ormond family of Tipperary.
What Is the Kennedy Connection to Brian Boru?
The Ormond Ó Cinnéide family belongs within the wider Dál gCais kindred of Thomond. Woulfe traces the Ormond family to Cinnéidigh, son of Donnchuan, who was a brother of Brian Boru. This places the Ormond O'Kennedys within Brian Boru's extended Dál gCais kindred.
This Cinnéidigh was a grandson of the earlier Cennétig, the Dál gCais ruler who died in 951 and was Brian Boru's father. Grandfather and grandson appear as separate figures in the sources, and it is the younger Cinnéidigh who gave the Ormond family its name.
Where Should Kennedy Researchers Look in Ireland?
For the Ormond tradition, east Clare and north Tipperary are especially important. For the separate Uí Maine family, County Galway matters. By the nineteenth and twentieth centuries the Kennedy surname was very common throughout Ireland, so a county, parish or townland from your own records shows where a particular family fits.
What About President John F. Kennedy's Irish Family?
President John F. Kennedy's paternal Irish roots are documented at Dunganstown near New Ross in County Wexford. The Kennedy Homestead identifies Patrick Kennedy as the president's great-grandfather and records his departure from Ireland in 1848. The Wexford records offer a documented starting point for the presidential family's Irish Kennedy history.
What is the Irish Kennedy surname?
Kennedy is a long-established English form of Irish Ó Cinnéide, with important Gaelic family traditions in Munster. Parish and townland records help place a particular Kennedy family within the relevant regional history.
How to Research a Kennedy Family Line
Start with the most recent Kennedy ancestor whose birth, marriage, death or residence you can document. Record the county and, where possible, the parish or townland. Then work backwards one generation at a time.
- 1901 and 1911 census: the National Archives of Ireland allows surname searches by county and location and provides images of the original household returns.
- Civil and church records: IrishGenealogy.ie provides free access to historic civil registration records and a substantial collection of church records.
- Earlier land and household sources: the National Archives genealogy collections include the Tithe Applotment Books and other record sets that can help bridge the period before surviving full censuses.
- Try historical spellings: Kennedy and O'Kennedy both occur in records, and the early form O Kinedy turns up in older documents.
Frequently Asked Questions About Kennedy
What is the Irish form of Kennedy?
Ó Cinnéide is the principal Irish form recorded in surname scholarship.
What does Kennedy mean?
The surname means “descendant of Cinnéidigh.” Woulfe glosses the personal name Cinnéidigh as “helmeted-head.”
Which counties is Kennedy most associated with?
East Clare, where the Ormond family was first seated at Glenomra; north Tipperary, where it ruled as lords of Ormond; and County Galway, home of the Uí Maine Kennedys. JFK's paternal line adds County Wexford to the map.
Are the Kennedys descended from Brian Boru?
The Ormond Ó Cinnéide family descends from Brian Boru's brother Donnchuan, through Donnchuan's son Cinnéidigh, which makes the O'Kennedys near kin of Brian himself within the Dál gCais.
Where were JFK's Irish ancestors from?
His paternal Kennedy ancestors are documented at Dunganstown in County Wexford. Patrick Kennedy, JFK's great-grandfather, left Ireland in 1848.
Sources and Further Research
- Patrick Woulfe, Irish Names and Surnames, “Ó Cinnéide”: Library Ireland transcription.
- Dictionary of Irish Biography, “Cennétig”: Royal Irish Academy / DIB.
- National Archives of Ireland: 1901 and 1911 census search.
- IrishGenealogy.ie: civil and church records.
- Kennedy Homestead, Dunganstown: Patrick Kennedy and the Wexford family.