Etymology Colquhoun (pronounced kə-HOON) is a Scottish habitational surname derived from the barony of Colquhoun in Dunbartonshire. The name likely originates from Scottish Gaelic elements, possibly còil or cùil meaning "nook" or "corner" combined with cumhann meaning "narrow," thus signifying "narrow corner." Another possible interpretation is coill(e) ("wood") + cumhann, yielding "narrow wood." A less common suggestion derives from comh-thonn ("wave crash"), though this is speculative. The silent 'l' reflects development in Scots, and the trigraph quh (representing /xw/) parallels English "wh," so an older spelling might have been "Colwhoun." Phonetic similarity to MacElhone/MacIlhone suggests that some instances of Colquhoun may derive from the Gaelic name Mac Giolla Còmhghan, where Còmhghan means "together-born." Historical Significance Colquhoun is the surname of the Scottish Clan Colquhoun, whose territory was in Dunbartonshire. The clan is likely of Celtic origin and traditionally held lands around Luss on Loch Lomond. The recorded history includes a notable feud with the Clan MacGregor in the 17th century, culminating in the Battle of Glen Fruin in 1603, where Clan MacGregor inflicted a heavy defeat on the Colquhouns. This event led to the proscription of the MacGregor name. Many notable bearers of the surname appear in military, political, and intellectual roles; for instance, Sir John Colquhoun (died 1653) was a Covenanting commander, while Patrick Colquhoun (1745–1820) was a Scottish merchant and statistician who founded the London Police Marine Force, part of the forerunners to the modern Metropolitan Police. Cognates and Variants The most prominent variant is Calhoun, resulting from phonetic changes and Anglicization. Other forms include Colhoun, Calhoon, Colhoon, Cohoon, Hoon, Cahoun, and Cahoon. These variants often share the same origins but reflect different regional pronunciations and spelling conventions over time. Meaning: "narrow corner" or "narrow wood" Origin: Scottish (Dunbartonshire barony) Type: Habitational surname Primary Regions of Use: Scotland, Northern Ireland (via descendants), United States