duncan
Etymology
Scottish GaelicEnglish
Duncan is a Scottish surname derived from the Gaelic personal name “Donnchadh,” composed of “donn” (brown) and “cath” (warrior) — meaning “brown-haired warrior” or “dark warrior.” The name entered English through medieval Scottish nobility and later spread as both a given name and surname. Isadora Duncan (born Dora Angela Duncan) carried the surname into twentieth-century fame. The city of Duncan, Oklahoma was named after William Duncan, an early cattle rancher in the region.