"Is my name Scottish or Irish?" It sounds like a simple question — and for a surprising number of surnames, the honest answer is both. Only twelve miles of sea separate Scotland from Ireland at the narrowest point, and for a thousand years people, soldiers and settlers crossed it in both directions, carrying their names with them. Here are the surnames found on both sides of the water, and the three great movements of history that put them there.
Quick Answer: Can a Surname Be Both Scottish and Irish?
Yes — many are. Names became shared through three main routes: shared Gaelic origins (Scotland's Gaelic culture came from Ireland, so names like Kennedy arose independently in both); the gallowglass mercenaries, Scottish warrior families such as MacSweeney and MacDonnell who settled in medieval Ireland; and the Plantation of Ulster, when seventeenth-century Scottish settlers carried names like Campbell, Stewart, Hamilton and Armstrong into the north of Ireland. For these names, "Scottish or Irish?" is less about the surname than about your own family's particular road.
Route One: Shared Gaelic Roots
Scotland's Gaelic language and culture arrived from Ireland in the early medieval period, so the two nations drew names from the same well — a kinship we explore in Gaelic vs Irish. Some surnames simply arose in both places. Kennedy is the classic case: in Ireland, Ó Cinnéide of Brian Boru's own kin; in Scotland, the powerful Kennedys of Carrick in Ayrshire — two great families, one name. Names built on shared Gaelic first names and words — the many Mac names among them — often have authentic lines in both countries, which is one more reason the spelling tells you nothing, as we cover in Mc vs Mac.
Route Two: The Gallowglass Warriors
From the thirteenth century, Irish kings hired elite mercenaries from the western Highlands and Isles — the gallowglass (from the Gaelic for "foreign warriors"). These Scottish fighting families were paid in land, settled permanently, and became thoroughly Irish over the generations while keeping their Scottish names. The MacSweeneys (from Scottish MacSween) became a great Donegal family; the MacDonnells of Antrim sprang from Scotland's mighty Clan Donald; the MacCabes settled in Cavan and Monaghan. If your Irish family bears one of these names, your line likely runs back through Ireland to the Scottish Isles — both heritages, in sequence.
Route Three: The Plantation of Ulster
The largest transfer came in the seventeenth century, when the Plantation of Ulster settled tens of thousands of Lowland Scots in the north of Ireland. They brought Lowland and Border names — Campbell, Stewart, Hamilton, Johnston, Armstrong, Craig, Kerr, Boyd, Morrison — which remain among the most common surnames in Ulster today. Their descendants include the Scots-Irish who later sailed for America in enormous numbers and helped build the young republic — a story we tell in Who Were the Scots-Irish in America? and Scottish Clan Surnames That Came to America Through Ulster.
So How Do I Know Which Side My Family Is From?
The surname alone often can't settle it — but your family's trail can. The useful clues are where your emigrant ancestors left from (an Armstrong from Fermanagh tells a different story than one from the Borders), your family's religious and community records, and the naming patterns in your tree. Start with the name's own story using How to Find Your Scottish Clan and the sept names list — and take heart: whichever road your family took, both heritages are yours to celebrate.
Scottish, Irish or proudly both — search your surname in the box above to see the crest and heritage gifts made for your family.
Frequently Asked Questions
Can a surname really be both Scottish and Irish?
Yes. Shared Gaelic origins, the gallowglass mercenary settlements and the Plantation of Ulster all created surnames with genuine roots in both countries.
Is Kennedy Scottish or Irish?
Both — independently. Ireland's Ó Cinnéide were kin of Brian Boru, while Scotland's Kennedys were a powerful Ayrshire family.
Who were the gallowglass?
Elite Scottish mercenaries from the Highlands and Isles who settled in medieval Ireland, founding Irish families such as MacSweeney, MacDonnell and MacCabe.
Why is Campbell so common in Ireland?
Largely through the Plantation of Ulster, when Lowland Scots settled the north of Ireland in the seventeenth century, bringing names like Campbell, Stewart and Hamilton.
Two Heritages, One Family
If your name walks both sides of the water, you have twice the story to tell. Search your surname in the bar at the top of the page to find your family's crest on flags, blankets, mugs and keepsakes.
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