In 1166, Muirchertach Mac Lochlainn, the most powerful king in Ireland and the last man from the north to seriously hold the high-kingship, was killed by his own kinsmen in Cenél nEógain territory after he blinded a rival under a broken oath of safe conduct. The annals record that his own allies abandoned him on the field. Genealogical tradition names the man who struck him down as Bloscadh Ó Catháin, a warrior of the O'Cahans of Derry. Five generations and eight centuries of anglicization later, Bloscadh's name survives as McCloskey, McCluskey, McLoskey — and McCluskie.
Quick answer: McCluskie is an anglicized spelling of the Irish Mac Bhloscaidh, "son of Bloscadh," a personal name borne by a 12th-century member of the O'Cahan (Ó Catháin) family of County Derry. The McCloskeys, and by extension the McCluskies, were the leading sept of the O'Cahans, lords of the barony of Keenaght in northern Derry, before the Ulster Plantation broke up their lands in the early 1600s. McCluskie is one of many spellings of the same name and is documented as a form used particularly in Scotland.
Where does the McCluskie name come from?
The root is the Irish personal name Bloscadh, and Mac Bhloscaidh means, literally, "son of Bloscadh." Father Patrick Woulfe's Irish Names and Surnames, still the standard reference on Gaelic name origins, records the entry under Mac Bhloscaidh and identifies it as "the name of a Derry family descended from Bloscadh Ó Catháin, who flourished in the 12th century." Woulfe lists a long run of anglicized forms taken from Irish-language records and later English-language documents: M'Blosgaid, M'Blosgaigh, M'Closkie, M'Loskie, MacCloskey, MacCluskey, MacLoskey, MacLuskey, Closkey, and Cluskey. McCluskie sits in that same family of spellings — the substitution of "ie" for "y" or "ey" at the end of a Gaelic-derived surname is a routine variation in Irish and Scottish record-keeping, especially once families or their clerks began writing the name down in English rather than Irish.
The O'Cahans themselves were a long-established Gaelic lordship, part of the wider Cenél nEógain grouping that also produced the Mac Lochlainn and O'Neill dynasties. Bloscadh Ó Catháin's descendants took his given name as a fixed surname sometime after his lifetime, following the standard pattern by which Gaelic Irish families converted a notable ancestor's first name into a hereditary Mac- or Ó- surname over the following century or two.
What territory did the McCluskie family hold in Ulster?
The O'Cahans ruled the barony of Keenaght, on the west bank of the River Bann in what is now County Derry, and the McCloskey sept — from which McCluskie descends — held a recognized position within that lordship, closely tied to the ecclesiastical center at Dungiven. County Derry heritage and genealogical sources consistently place the sept there rather than anywhere else in Ireland, and the concentration of McCloskey-family baptismal and marriage records in Derry parishes through the 17th and 18th centuries bears this out.
That territory came under direct assault during the Ulster Plantation of the early 1600s, when the English Crown confiscated O'Cahan and O'Neill lands across the six escheated counties and granted them to London trade guilds, which renamed much of the O'Cahan heartland "Londonderry." The McCloskeys and their kin did not vanish from the area — Derry and its surrounding baronies remained, and remain, a stronghold of the name in all its spellings — but the plantation ended their standing as a landholding sept and pushed many families into tenancy, emigration, or both over the following two centuries.
Families researching the McCluskie name today are usually looking for a way to hold that Derry story rather than just read about it. A few pieces built around the name work well for that: a McCluskie heritage mug for daily use, a McCluskie garden flag to mark the house, or a McCluskie ceramic ornament for a shelf or tree. Each carries the McCluskie name set against the Irish national tartan rather than a generic shamrock design.
Everything currently made for this name — and anything added later — can be browsed together in the McCluskie Irish Family Gifts & Heritage.
Is McCluskie the same name as McCloskey and McCluskey?
Yes. McCluskie, McCloskey, McCluskey, McLoskey, McLuskey, Cluskey, and Closkey all descend from the single Irish form Mac Bhloscaidh — they are not separate families that happen to sound alike, but recorded variants of one surname produced by centuries of anglicization, regional pronunciation, and inconsistent spelling in parish and civil records. Before the 20th century, when literacy was uneven and clerks wrote down names phonetically, the same family could appear under two or three different spellings across a single generation of birth, marriage, and death records.
McCluskie is a comparatively less common form of the name today. Geneanet's surname research, citing the Oxford Dictionary of Family Names in Britain and Ireland, describes McCluskie specifically as a Scottish spelling of McCluskey — evidence that this particular form took hold among Ulster families who crossed to Scotland, whether during the Plantation period, in the seasonal and permanent labor migrations of the 18th and 19th centuries, or afterward. Ancestry's own family-history records back this up: McCluskie households turn up most heavily concentrated in Scotland in the 1841 census, alongside smaller but steady numbers in Ireland, England, the United States, and Canada by the early 20th century. The spelling did not stay fixed to one side of the North Channel — a McCloskey emigrating from Derry to Glasgow or Ayrshire could just as easily have a McCluskie recorded on the far side of the crossing.
Where do McCluskies live today?
The wider McCloskey name remains, in Woulfe's words, "still common in Derry and other parts of Ulster," and that holds for the region as a whole. McCluskie specifically shows up in smaller numbers, consistent with a variant spelling rather than the dominant form — Geneanet's database counts it among the less common surname forms it tracks, a few hundred bearers rather than thousands. Scotland carries a real concentration of the name going back to at least the mid-19th century, and from there the family spread with the wider Scottish and Irish diaspora to the United States, Canada, and beyond, showing up in census and immigration records in states like Tennessee from the 1840s onward and continuing through the 20th century.
One of the better-known bearers of the closely related McCloskey spelling was John McCloskey, who became Archbishop of New York and, in 1875, the first American ever elevated to Cardinal — a reminder of how far the Keenaght name traveled from the banks of the Bann. The McCluskie spelling has stayed smaller and quieter by comparison, but it carries the identical Derry root.
Frequently Asked Questions About the McCluskie Name
What does McCluskie mean in Irish?
McCluskie comes from the Irish Mac Bhloscaidh, meaning "son of Bloscadh." Bloscadh was a personal name, not a description or occupation, so the surname itself does not translate to an English word or trait — it simply marks descent from a specific 12th-century ancestor.
Is McCluskie an Irish or a Scottish name?
Both, in a sense. The name originates in County Derry, Ireland, among the O'Cahans, but McCluskie in particular is documented as a spelling that became established in Scotland, most likely carried there by Ulster families who crossed the North Channel. The underlying surname is Irish; this specific spelling has a strong Scottish history.
Is McCluskie related to McCloskey?
Yes. McCluskie and McCloskey are variant spellings of the same Irish surname, Mac Bhloscaidh, along with McCluskey, McLoskey, McLuskey, Cluskey, and Closkey. They share one common ancestor and one origin in County Derry.
What clan or family group did the McCluskies belong to?
The McCloskey sept, and the McCluskie spelling within it, belonged to the O'Cahans (Ó Catháin), lords of the barony of Keenaght in County Derry, who were themselves part of the larger Cenél nEógain grouping in medieval Ulster.
Where in Ireland did the McCluskie family come from?
County Derry, specifically the Keenaght barony on the west side of the River Bann, near Dungiven. This remained the core territory of the wider name through the medieval and early modern periods, before the Ulster Plantation broke up O'Cahan landholding in the early 1600s.
Sources and further reading
Patrick Woulfe, "Mac Bhloscaidh," Irish Names and Surnames (1923), via Library Ireland
McCloskey One-Name Study, Guild of One-Name Studies
Annals of Ulster, entry for 1166, CELT: Corpus of Electronic Texts, University College Cork