| Gaelic form | Mac Cába |
| Meaning | Son of Cába — possibly from an Old Norse personal name meaning 'helmet' |
| Origin type | Scottish-Gaelic Mac prefix — gallowglass sept, later established in Ulster |
| Primary county | County Cavan / County Monaghan |
| Variants | See below |
The McCabe surname has a distinctive origin: the family were originally gallowglass — Scottish Gaelic warrior-mercenaries who came to Ireland as military retainers, typically from the Western Isles of Scotland. The gallowglass were elite infantry, armed with axes and heavy swords, who served the great Gaelic lords of Ireland from the 13th century onward.
The Mac Cába family settled permanently in Ulster, establishing themselves as hereditary military commanders in what is now County Cavan and County Monaghan — the heart of the old kingdom of Breifne. They served primarily the O'Reilly family (lords of East Breifne, modern Cavan) and maintained their warrior status across several centuries, intermarrying with native Ulster families and becoming thoroughly Gaelicised.
The name's origin — Mac Cába, "son of the helmet" — reflects the martial culture from which the family emerged. Old Norse personal names containing kápa (cloak) or related terms entered the Gaelic world through centuries of Norse settlement in the Western Isles, and Mac Cába likely preserves one of these Viking-era names.
William Putnam McCabe (1776–1821) was a prominent United Irishman from Belfast who was deeply involved in the 1798 rebellion. After the rebellion's defeat he fled to France and later America, where he worked in the cotton industry. His story represents the broader McCabe pattern: Ulster-born, nationalist, and ultimately part of the Irish diaspora.
In modern Ireland, McCabe is strongly associated with Counties Cavan and Monaghan. The name is common in the GAA — Cavan football has produced several notable players named McCabe. Varrie McCabe was a celebrated 19th-century Ulster musician whose compositions are still performed today.
McCabe families emigrated primarily to the United States, particularly to New York and New Jersey, where significant Ulster and Cavan emigration concentrated from the 1820s onward. The 1840s Famine sent further waves, and McCabe families are documented throughout the Irish communities of the northeastern United States.
In Britain, the Ulster proximity meant McCabe families settled in Glasgow, Liverpool, and Manchester. Scottish McCabes — many of them still in the Western Isles or Ayrshire — share a common Gaelic origin with their Irish cousins, though the Scottish line never came to Ireland.
County Cavan and Monaghan records are held at the National Archives of Ireland. Griffith's Valuation shows McCabe families concentrated around Cavan town and the Monaghan border parishes. The 1901 and 1911 Census records are searchable free at census.nationalarchives.ie.
Diocese of Kilmore covers most of County Cavan. These registers, going back to the 1760s in some parishes, are available through RootsIreland.ie.
The Ulster Historical Foundation in Belfast specialises in Ulster surname research and holds significant McCabe family material in its archives.
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