The name Duncan ranked 486th in popularity for males of all ages in a sample of 2000-2003 Social Security Administration statistics and 803rd in popularity for males of all ages in a sample of the 1990 US Census.
Though this name appears on the 1990 U.S. Census lists, it is used by only a small percentage of the general population.
Duncan I (died 1040)
King of Scotland, 1034-40.
Called ''''the Gracious''''; defeated and killed by Macbeth, who may have been his first cousin (see list of Scottish Monarchs)
Duncan II (died 1094)
King of Scotland, May - Nov. 1094.
Killed by Donald Bane, who was the younger brother of Duncan''s father, King Malcolm III (see list of Scottish Monarchs)