Definitions from Wiktionary (Duncan)

▸ noun:  A male given name from Scottish Gaelic anglicized from Scottish Gaelic Donnchadh; the name of two early saints and of two kings of Scotland.
▸ noun:  A Scottish surname originating as a patronymic.
▸ noun:  A surname from Irish, a variant of Dinkin.
▸ noun:  An Irish surname, a variant of Donegan.
▸ noun:  An Irish surname, a variant of Dunican.
▸ noun:  An Irish surname, adopted as an anglicization of Ó Donnchadha (whence Donoghue).
▸ noun:  A locality in South Australia, Australia; named for politician John Duncan.
▸ noun:  A city in British Columbia, Canada; named for early settler William Chalmers Duncan.
▸ noun:  A locale in the United States.
▸ noun:  A city, the county seat of Stephens County, Oklahoma; named for early settler William Duncan.
▸ noun:  A town in South Carolina; named for landowner Leroy Duncan.
▸ noun:  A town in Arizona; named for copper businessman Duncan Smith.
▸ noun:  A town in Mississippi.
▸ noun:  A village in Nebraska; named for early resident Wood B. Duncan.
▸ noun:  A census-designated place in Iowa.
▸ noun:  An unincorporated community in Indiana.
▸ noun:  An unincorporated community in Casey County, Kentucky.
▸ noun:  An unincorporated community in Mercer County, Kentucky.
▸ noun:  An unincorporated community in Missouri.
▸ noun:  An unincorporated community in North Carolina.
▸ noun:  Four townships, in Illinois, Michigan, Missouri and Pennsylvania, listed under Duncan Township.
▸ noun:  A river in British Columbia, Canada; running 206 km near Mount Dawson into the Kootenay Lake; named for prospector John Duncan.
▸ noun:  A short river in the Southern Alps, New Zealand.

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