/klæn/
[noun] A large group of families who share the same ancestor and often the same surname, especially in Scotland or Ireland. More broadly, it can mean any close-knit group of people who feel like family.
The word 'clan' comes from a Gaelic word meaning 'children' — so every Scottish clan is literally a family of children bound by blood.
The word 'clan' entered English in the 15th century directly from Scottish Gaelic 'clann', which meant 'children' or 'offspring' — and more broadly, 'family' or 'descendants'. This was not a metaphor or a poetic stretch; the Gaelic speakers of Scotland and Ireland genuinely understood their social groups as extended families, all descended from a single ancestor. When you called yourself a member of Clan MacGregor or Clan Campbell, you were saying, in effect, 'I am one of his children.'
The Gaelic 'clann' itself descends from Old Irish 'cland', and both trace back to a Latin root: 'planta', meaning a shoot, sprout, or cutting from a plant. This connection reveals a striking piece of linguistic history — Latin 'planta' → Old Irish 'cland' → Scottish Gaelic 'clann' → English 'clan'. The initial 'pl-' sound of Latin shifted to 'cl-' as the word moved into the Celtic languages of the British Isles, a common phonetic change in Gaelic. The metaphor embedded in the original Latin is beautiful: a clan is like a plant, with its members as the shoots and branches growing outward from a single root.
Interestingly, the same Latin root 'planta' also gave English the word 'plant' itself, through a more direct route: Latin 'planta' → Old French 'plante' → Middle English 'plante' → English 'plant'. So 'clan' and 'plant' are, in a sense, distant cousins — both carrying the ancient idea of something that grows and spreads from a common source. The image of a family tree is, it turns out, deeply embedded in the very word we use to describe a family group.
For centuries, the clan system was the dominant social structure in the Scottish Highlands and in Ireland. Clans controlled land, provided protection, and demanded loyalty. A clansman owed his chief absolute allegiance, and in return the chief was expected to protect and provide for all who bore his name. The Highland clans became famous — or infamous — across Europe, particularly after the Jacobite uprisings of the 17th and 18th centuries, when clans like the MacDonalds and the Campbells found themselves on opposing sides of bloody conflicts. After the defeat at Culloden in 1746, the British government actively tried to destroy the clan system, banning Highland dress and the Gaelic language.
English speakers outside Scotland began using 'clan' more freely from the 18th century onward, first applying it to Irish and other tribal family groups, then gradually widening it to describe any tightly bonded social group. By the 19th century, novelists and journalists were using 'clan' to describe any close circle — a group of friends, a political faction, even a family at a dinner table. Today, the word carries both its precise historical meaning and a warm, informal sense of belonging. When someone says 'my whole clan is coming to the reunion,' they are reaching back, without knowing it, all the way to an ancient Gaelic word for children, and beyond that to a Latin word for a green shoot pushing up from the earth.