The surname Duncan has its origins in Scotland and is derived from the Scottish Gaelic names Donncheann or Donnchadh. These names are composed of the elements "donn," meaning "brown" or "dark," and "chadh," meaning "chief" or "noble." The name is associated with the Gaelic god Donn. In Ireland, particularly in County Sligo, Duncan can be an Anglicized form of the Irish Gaelic names MacDonough or Mac Donnchadha, as well as Ó Duinnchinn, which translates to "descendant of Donncheann." In Scottish Gaelic, the surname is represented as MacDhonn.
Based on Census data, Duncan ranks #212 among U.S. last names, with an estimated 135187 individuals — approximately 46 per 100,000 people.
Our database contains over 138085 people with the last name Duncan. This surname is most commonly found in Texas, Florida, California. We have over 94 unique first names combined with the last name Duncan in our records. The most frequent first names associated with this surname are Robert, David, James.
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