People with the last name Duncan
129,708
About 1 in 2,555 Americans had this surname in the 2020 Census.
Aggregated, privacy-protected national data. No individual records are included.
U.S. surname statistics
How common is Duncan?
Duncan was the #222 most frequent surname in the 2020 Census.
National rank
#222
Among published U.S. surnames
Census count
129,708
People in the 2020 national table
Census frequency
1 in 2,555
Across the 2020 U.S. population
Demographic distribution
Aggregated race and Hispanic-origin reporting in the 2020 Census name table.
What this count includes
The Census Bureau’s surname table is a national statistical release. It counts people who reported Duncan as a last name and publishes only surnames occurring at least 100 times.
The values contain privacy-protecting statistical noise. They are excellent for understanding national frequency, but small differences should not be read as exact headcounts.
Demographic distribution describes the aggregate Census categories among bearers of the surname. It does not establish any individual’s identity, ancestry, or nationality.
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