Duncan is an Anglicised form of Irish Donnchadh. One of the first people to bear the name was king of Dál Riata Dúnchad mac Dubáin, who was possibly the grandfather of Fiannamail ua Dúnchado-Fiannamail O'Dúnchado. The final letter n in the Anglicised Duncan seems to be a result of confusion in the Latin form of the name—Duncanus—with the Gaelic word ceann, meaning "head". One opinion is that the Gaelic Donnchadh is composed of the elements donn, meaning "dark or dark-haired man" or "chieftain"; and cath, meaning "battle", together meaning "dark-haired or dark warrior". Another opinion is that the Gaelic Donnchadh is composed of the elements donn, meaning "brown"; and chadh, meaning "chief" or "noble".

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