From Mac Gabhann to Smith: How Irish Surnames Were Anglicised
A Smith and a McGowan can be the very same Gaelic family. Here's how English law and English-speaking clerks turned Mac Gabhann into Smith, and how to trace your own name back.
Here's a small mystery that catches a lot of people out: a family called Smith and a family called McGowan can be the very same Gaelic clan. Both go back to Mac Gabhann, "son of the smith." How one Irish name ended up as two very different English ones is really the story of how Gaelic surnames were slowly stripped of their Irishness under English rule.
It happened in two ways. There were a handful of blunt, coercive laws, but far more of the actual work was done by the quiet, relentless grind of a state that ran entirely in English.
The law that ordered new names
The bluntest example comes from 1465. A statute of Edward IV ordered every Irishman living within the Pale (the English-controlled district around Dublin, Meath, Louth and Kildare) to drop his Gaelic name and take an English one instead:
"…shall take to him an English surname of one town, as Sutton, Chester, Trim, Skryne, Cork, Kinsale; or colour, as White, Black, Brown; or art or science, as Smith or Carpenter; or office, as Cook, Butler…"
Refuse, and you forfeited your goods. In a single stroke, families were pushed to name themselves after an English town, a colour, a trade, or a job in a great house. A surprising number of Irish Whites, Blacks, Cooks, Butlers, Smiths and Carpenters trace back to exactly this pressure.
A century later, under the Tudors, the tell-tale Gaelic prefixes Ó ("grandson/descendant of") and Mac ("son of") were suppressed too, enforced by martial law as part of forcing the native Irish into what the authorities called "English civility."
The clerks who "Englished" the rest
Most names, though, weren't changed by any single order. They were changed at the tip of a pen. As English administration, courts, taxes and land records spread across Ireland in the 1500s and 1600s, Gaelic names had to be written down by English-speaking clerks, and those clerks did one of two things.
They translated the meaning. Mac Gabhann means "son of the smith," so a clerk who understood a little Irish simply wrote down Smith. This is especially the story in County Cavan, the Mac Gabhann heartland, where the name became Smith and stayed that way. The same fate met many others:
- Breathnach ("the Briton / Welshman") → Walsh
- Mac an Bhreithimh ("son of the judge") → Judge
- Ó Draighneáin (from draighean, the blackthorn) → Thornton
Or they just spelled out the sound. A clerk who didn't translate simply wrote the name as he heard it, so the very same Mac Gabhann became McGowan. That's why Smith and McGowan are so often the same original surname: one family's name was translated, the other's was spelled phonetically. From the surname alone, you often can't tell which road a family took.
The great 19th-century scholar John O'Donovan reckoned the biggest driver was plain contempt: "the ridicule thrown upon [Gaelic names] by English magistrates and lawyers who were ignorant of the Irish language." When your name marks you out as an outsider in every courtroom and rent office, the pressure to shed it is enormous.
Why the Ó and the Mac disappeared, then came back
Through the Penal era of the 1600s and 1700s, the Ó and Mac prefixes fell away almost entirely. A conspicuously Gaelic name was a practical liability, and going without the prefix came to feel modern and respectable. Ó Súilleabháin became plain Sullivan; Ó Ceallaigh became Kelly; Ó Briain became Brien.
Then the tide turned. During the Gaelic Revival of the late 1800s and early 1900s (the same movement that revived the language, the games and the music), families began deliberately putting the prefixes back as a point of pride. That's why today you'll find Sullivan and O'Sullivan, Gowan, McGowan and Smith, all branching from the same Gaelic roots.
Tracing your own name back
So if your surname is Smith, Walsh, Kelly or Sullivan, there may well be a Gaelic original sitting just behind it: Mac Gabhann, Breathnach, Ó Ceallaigh, Ó Súilleabháin. Learning to recognise the Ó ("descendant of"), Mac ("son of") and Ní / Nic (the forms used for women) is the first step to reading your own name the way it was first meant to be said.
👉 Look your own family up in the Irish surnames: sixty of them with the Irish spelling, how it is said, the forms a woman of the family uses, and the county the name belongs to.
👉 Explore the story of the era that reshaped so much of this on our Irish history timeline, including the Penal Laws and An Gorta Mór, or start learning the language your ancestors carried in the vocabulary lessons.
Cén sloinne atá ort? What's your surname? It may have more Irish in it than you think. 🍀