The surname Sligo has an obvious Irish explanation, and the leading surname dictionary prefers a Scottish one.
That reading turns on one recorded form: Petslegach, written down in 1408. It is an early spelling of Pitsligo on the Buchan coast of Aberdeenshire, and the Oxford-backed Dictionary of American Family Names suggests Sligo may be that place-name worn down to its last syllables. It says "perhaps", and the hedge matters throughout.
Is Sligo an Irish Surname or a Scottish One?
Not what most people expect. Scotland held 32 Sligos at the 1901 census, ranking the name 6,206th: scarce, but real. The equivalent index of the 1901 and 1911 Irish censuses returns no entry for Sligo at all.
So the county is not the surname. It lies behind dozens of Irish family names, none of them Sligo; our roundup of the surnames of County Sligo sets out what those families were called, and our guide to the castles of Connacht covers the country itself.
That does not close the Irish road. Toponymic names are often formed abroad, by neighbors labeling an incomer, and Irish families moved into Scotland in enormous numbers, as our account of one Irish name in the Lanarkshire ironworks shows. Both routes stay open; the Aberdeenshire reading is better documented rather than proven.
What Does Pitsligo Mean?
Here the two ends of the story touch. Pitsligo belongs to the northeastern family of Pit- names, built on a Pictish element meaning a portion of land, the pattern behind our history of the Pitcairn name. Its second element is usually read as Gaelic sligeach, shelly: a share of land abounding in shells.
Sligeach is also the Irish name behind Sligo, describing the shelly river mouth at the head of the bay. Two shorelines, one Gaelic word: shared vocabulary rather than shared ancestry, which explains why the names look alike without connecting anybody's family. The Gazetteer for Scotland gives no etymology for Pitsligo at all, so even the shelly reading rests on place-name commentary rather than on a charter.
Where Was Pitsligo?
On the Moray Firth coast three miles west of Fraserburgh, a parish of nine square miles disjoined from Aberdour in 1633, holding the fishing villages of Rosehearty, Pittulie and Sandhaven. The Ordnance Survey Name Book for Aberdeen County gives it a volume to itself, which is where to start on older spellings. The castle keep went up in 1424, and in 1633 Alexander Forbes was made Baron Forbes of Pitsligo; his great-grandson forfeited the title for the 'Forty-five. The wider family appears in our history of the Forbes name, and north-eastern naming habits in our account of the Cruickshank name.
Who Was John Sligo?
The best-documented bearer, and thoroughly Scottish. John Sligo (1794 to 1858) was the son of a Leith tea and spirit merchant, went into trade himself, and did well enough to spend his spare time on geology. He was elected a Fellow of the Royal Society of Edinburgh in 1832, took a house at 5 Drummond Place, and in 1857 became a director of the Edinburgh and Bathgate Railway. One man is not a pedigree, but a Leith merchant family carrying the name is evidence the Irish reading lacks.
How Should a Sligo Line Be Traced?
- Search Sligo, Slego, Sleigo and Sligoe together, and test Pitsligo separately in older documents. With 32 bearers nationally, one spelling will not carry you far.
- Decide early which country you are in. A Scottish line points at Edinburgh, Leith and the north-east; an Irish one points at emigration records rather than Irish census returns.
- Anchor the name in statutory registers before guessing at origins, using our ScotlandsPeople guide.
- Ignore the Marquess of Sligo. That is an Irish peerage whose holders are surnamed Browne, of Westport in County Mayo, followed in our history of the Browne name. Nobody was surnamed Sligo because of it.
Own a Piece of Sligo Heritage
Shells lie behind both Pitsligo and the Irish town, and a name taken off a shoreline suits something meant to stand outdoors. Three pieces exist: an accent mug, a garden flag and a framed keepsake ornament, the family crest set against a tartan background on every one. There is no chief to have approved a weave for Sligo and none was ever made, so the cloth is a design choice taken for the product. Our explainer on Scotland's tartan conventions sets out what really applies.
Frequently Asked Questions About the Sligo Name
Is Sligo an Irish surname?
Less than the county name suggests. It returns no entry in the index of the 1901 and 1911 Irish censuses, while 32 bearers appear in Scotland in 1901. An Irish origin by migration cannot be ruled out, but the record does not support it.
Does Sligo come from Pitsligo?
Perhaps, and "perhaps" is the dictionary's own word. The Dictionary of American Family Names offers Sligo as a possible reduced form of Pitsligo, recorded as Petslegach in 1408. That is the best-supported reading available, not a settled one.
Is there a Clan Sligo?
No. The name is on no roll of Scottish clans and has neither chief nor tartan of its own.
Sources and Further Reading
- Ordnance Survey Name Book, Aberdeen County, volume 74 — the ScotlandsPeople volume for Pitsligo parish place-names.
- The Gazetteer for Scotland: Parish of Pitsligo — the 1633 disjunction, the 1424 keep, the forfeited Forbes lordship.
- Dictionary of American Family Names: Sligo — "perhaps a reduced form of Pitsligo (Aberdeens) recorded as Petslegach in 1408."
- Sligo in the 1901 Scottish census — 32 bearers, ranked 6,206th.
- Sligo in the Irish censuses — the index returns no entry.
- Pitsligo — the name read as Peit Shligeach, land abounding in shells.
- John Sligo — the Leith merchant and geologist, FRSE 1832.
Thirty-two bearers in 1901, a shelly shore in Buchan, and a dictionary hedge nobody should quietly delete.