Duncan

Gender: Masculine
Origin: Scottish
Meaning: “brown warrior.”
(DUN-ken)

Duncan is an anglicized form of the Scots-Gaelic Donnchadh which is composed of the elements, donn (brown) and cath (warrior). The name was borne by Duncan I of Scotland, the inspiration behind Shakespeare’s play Macbeth (1606).

Currently, Duncan is the 705th most popular male name in the United States, (2010) and the 259th most popular in the Netherlands (2010).

Other forms of the name include:

Donagh (Irish)
Donnchad (Irish/Scottish)
Donnchadh (Irish/Scottish)

Source

1. http://www.behindthename.com/name/duncan