Surname Origin
Surname Entry

McKenna

An Irish and Scottish Gaelic patronymic, chiefly associated in Ireland with Mac Cionaoith and the barony of Trough in County Monaghan.

Last updated: 2026-08-14

McKenna is chiefly an Irish Gaelic patronymic surname, anglicised from Mac Cionaoith, literally “son of Cionaodh.” Its best-documented Irish territorial association is Trough in northern County Monaghan. Modern surname dictionaries also recognise Scottish use and group McKenna with forms of McKinney, so the spelling alone does not identify one country, kindred, or line of descent.

Meaning and Irish Forms

The Gaois Database of Irish-Language Surnames, maintained by Fiontar & Scoil na Gaeilge at Dublin City University, gives the root personal name as Cionaodh and the present Irish surname as Mac Cionaoith. Patrick Woulfe’s Irish Names and Surnames records both Mac Cionaodha and Mac Cionaoith and glosses the construction as “son of Cionaodh.” This makes McKenna a surname formed from an ancestor’s personal name, not an occupational or locational name.

The literal meaning that can be stated securely is therefore “son of Cionaodh.” The consulted surname authorities identify Cionaodh as a personal name but do not support reducing it to a simple modern English noun. Popular expansions of McKenna into more elaborate meanings should be treated as speculative unless they cite a specialist history of the personal name itself.

Irish surname forms also change with grammar and family relationship. Gaois lists Mac Cionaoith for a man, Mhic Cionaoith for a wife using the surname, and Nic Cionaoith for a daughter. It separately records Mac Cionnaith as a historical Irish form. These are meaningful Irish-language forms, not random misspellings of English McKenna.

Trough, Monaghan, and the Historical Record

The link with County Monaghan is unusually specific. Woulfe describes a Mac Cionaodha family, associated with the southern Uí Néill, as chiefs of Trough in the north of the county. The Dictionary of American Family Names, second edition, likewise identifies an Irish chiefly family in the barony of Trough in north-west Monaghan. Trough is therefore more than a vague “Ulster origin” attached to the name: it is the territory consistently identified by the main surname dictionaries.

There is also a concrete medieval occurrence. In the Annals of the Four Masters, entry M1325.11 in the Irish text names Donnchadh Mac Cionaith; John O’Donovan’s English translation renders the name as Donough Mac Kenna and says that he was killed in “Mac Mahon’s church.” The annals are a later compilation preserved through later manuscripts, and the CELT edition warns that its chronology and nineteenth-century translation have limitations. The entry is evidence that a recognisable form of the surname belonged in the medieval Irish historical tradition; it should not be advertised as the first McKenna record or used to connect present-day bearers to Donough.

Woulfe also notes a Mac Cionaodha family in County Roscommon who followed the O’Connors. That second association matters because even within Ireland the surname should not be treated as proof that every McKenna descends from the Monaghan chiefly family. The Oxford dictionary’s Irish-and-Scottish classification adds another reason to keep etymology separate from genealogy.

Anglicisation and Overlapping Names

English records did not turn one Irish spelling into one fixed English spelling. Woulfe groups M’Kinna, M’Kenay, M’Kena, MacKinney, MacKinny, MacKenny, MacKenna, MacKeany, and Kenny under Mac Cionaodha or Mac Cionaoith. Gaois currently associates McKenna, Kenna, McKenny, McKinney, and Kenny with the same Cionaodh root.

Those lists are search aids, not a claim that every bearer of those names has the same origin. Woulfe separately records Mac Coinnigh, “son of Coinneach,” and says that its anglicised forms can no longer be distinguished from those of Mac Cionaoith. The 2022 Oxford entry similarly treats Irish and Scottish McKenna as a variant of McKinney. As a result, a historical McKinney, Kenny, or Kenna record may be relevant to a McKenna family, but only matching place, dates, relatives, and other documents can establish that it is the same line.

McKenna, MacKenna, and older M’Kenna commonly represent different ways of writing the prefix. They should be searched together, but Mc versus Mac is not by itself evidence of a separate lineage.

Evidence for the Monaghan Concentration

The Monaghan connection remained visible at the start of the twentieth century. Barry Griffin’s tabulation of the official 1901 census normalises Mc, Mac, and M’ spellings under MACKENNA. It counts 9,024 people across Ireland and ranks the normalised surname sixtieth nationally. In County Monaghan, the same tabulation counts 2,067 people and places MACKENNA first among surnames in the county.

These figures are a census snapshot, not a measure of medieval ancestry. They do, however, provide quantitative support for the surname dictionaries’ association with Monaghan. Because the tabulation deliberately combines prefix spellings, its total should not be read as a count of the exact written form McKenna. The National Archives of Ireland provides the underlying 1901 and 1911 household returns and allows individual entries and original forms to be checked.

Using the Name as Genealogical Evidence

For a particular McKenna family, the useful question is not whether the surname has a Monaghan history—it does—but whether the family’s own records lead there. A documented place in Ireland is stronger evidence than a surname tradition alone. Research in Monaghan should distinguish the barony of Trough from the county as a whole and then narrow the line to a parish and townland.

The spelling evidence calls for two complementary searches:

  • Search McKenna, MacKenna, and M’Kenna as prefix variants.
  • Check McKenny, McKinney, Kenna, and Kenny where dates and locality make them plausible, but do not merge those surnames automatically.
  • Recognise Mac Cionaoith, Mhic Cionaoith, Nic Cionaoith, and historical Mac Cionnaith in Irish-language material.
  • Treat the medieval annal and the history of the Trough chiefs as surname context, not as a ready-made pedigree.

This distinction is essential: a shared spelling can indicate a shared linguistic tradition without proving that two modern McKenna families share a recent ancestor.

References

Related Surnames

Maguire McCann McMahon