From Irish 'Ó Ciardha' meaning 'descendant of the dark one,' or Welsh place name origin.
Carey is a name with dual heritage — Welsh and Irish — that arrived in English usage as a surname long before it became a given name, and its geography is embedded in its bones. In Welsh, the name is thought to derive from the element caer, meaning "fort" or "castle," attached to a place on the River Cary in Somerset. The Irish stream flows from the Gaelic Ó Ciardha, meaning "descendant of Ciardha," where ciardha itself means "dark" — a reference to dark hair or complexion rather than temperament.
Two origins, both rooted in land and lineage. As a surname, Carey appears throughout Irish and British history with notable bearers: the Tudor courtier Henry Carey, first Baron Hunsdon, was the son of Mary Boleyn and possibly — court gossip has never settled the matter — of Henry VIII himself. William Carey, the eighteenth-century Baptist missionary, carried the name to India and is credited with founding the first Bengali newspaper.
The name crossed into American given-name usage in the nineteenth century and has moved comfortably between genders ever since, borne by the comedian Drew Carey, and sharing phonetic space with the global superstar Mariah Carey. Carey's gentle ambiguity — neither aggressively masculine nor decisively feminine — has kept it in steady use across generations without ever becoming common. It carries an air of quiet capability, the name of someone who can hold a fort or navigate the dark, depending on which etymology one prefers to claim.