McCarthy is a major Irish surname with deep historical associations in Munster, especially Cork and Kerry. It corresponds to Irish Mac Cárthaigh, meaning “son of Cárthach.”
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What Does McCarthy Mean?
Mac Cárthaigh is a patronymic form meaning “son of Cárthach.” Patrick Woulfe records MacCarthy, MacCarty and related spellings under this form. A separate surname, Ó Cárthaigh, anglicized O’Carthy, Carthy and Carty, belonged to families in Tipperary, Clare and Roscommon.
Where Is the McCarthy Name Most Strongly Associated in Ireland?
The historical MacCarthy story is centered in Munster. Surname scholarship places major branches in Kerry, Carbery in west Cork and Muskerry in mid-Cork. For modern family research, Cork and Kerry are especially important starting points. Parish, townland and family records can connect a particular McCarthy line with its local history.
Which Historical MacCarthy Branches Are Documented?
Historical sources record three great MacCarthy dynastic branches and numerous minor ones. Woulfe identifies MacCarthy Mór in Kerry, MacCarthy Reagh in Carbery and MacCarthy of Muskerry. Dictionary of Irish Biography entries independently document MacCarthy lords in Carbery and the wider Desmond political world. Blarney Castle is particularly associated with the Muskerry branch.
This branch structure maps neatly onto the landscape: MacCarthy Mór held sway in Kerry, MacCarthy Reagh in west Cork and the Muskerry line in mid-Cork. In 1565 Donal MacCarthy Mór was created Earl of Clancar.
How Did the Name Spread Beyond Ireland?
McCarthy became established throughout the wider Irish diaspora, especially in Britain, North America and Australia. Migration records, civil certificates and census returns can help bridge a family from a destination country back to a specific Irish place. The most productive question for a researcher is which townland, parish or county a McCarthy family left from.
How to Research McCarthy Family History in Ireland
- Start with the spelling used in your own records. Check McCarthy, MacCarthy and MacCarty; Carthy and Carty usually belong to the separate Ó Cárthaigh name.
- Identify a place. County, parish and townland evidence anchors a McCarthy family in Cork, Kerry or beyond.
- Search the 1901 and 1911 censuses. The National Archives of Ireland lets you search by surname, county, townland/street and other household details.
- Use civil and church records. IrishGenealogy.ie is the state’s free portal for many Irish civil and church records.
McCarthy Surname FAQ
Is McCarthy an Irish surname?
Yes. McCarthy is a well-documented Irish surname corresponding to Mac Cárthaigh and historically associated with Munster.
Does McCarthy mean “loving”?
Woulfe connects the personal name Cárthach with the sense “loving.” The surname itself means “son of Cárthach,” taken from Cárthach, lord of the Eoghanacht, who died in 1045.
Which MacCarthy branches ruled in Munster?
The three great branches were MacCarthy Mór, based chiefly in Kerry, MacCarthy Reagh, lords of Carbery in west Cork, and MacCarthy of Muskerry in mid-Cork, whose strongholds included Blarney Castle. Before the Anglo-Norman invasion the MacCarthys were kings of Desmond.
Sources and Further Research
- Patrick Woulfe, Irish Names and Surnames, “Mac Cárthaigh” and “Ó Cárthaigh.”
- Dictionary of Irish Biography, Royal Irish Academy — MacCarthy entries on the Carbery and Desmond dynasties.
- National Archives of Ireland — 1901 and 1911 census search.
- National Library of Ireland — Office of the Chief Herald of Ireland.
- IrishGenealogy.ie — state-run civil and church record search.