How Many People Are Named Duncan?
An estimated 17,392 people in the United States have the first name Duncan. It is almost exclusively a male name. The average bearer is 34 years old, and Duncan peaked in popularity in 1997 with 644 births that year.
Below you will find a full statistical profile of Duncan as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Duncan paired with any surname.
Estimated Living Americans
17,392
About 1 in 19,708 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
99.9% confidence
Average Age
34
years old
Peak Year
1997
644 births
Total Registered
21,043
since 1880
Gender Distribution for Duncan
Duncan is almost exclusively a male name. Out of 21,043 total births registered, 99.9% were male.
Duncan as a male name
Ranked #1,102 in 2024
194 male births in 2024
Peak: 1997 (644 births)
Duncan as a female name
Ranked #17,190 in 2015
5 female births in 2015
Peak: 1996 (6 births)
Duncan: Popularity Over Time
SSA records for Duncan span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1990s, when 4,227 babies were registered. Duncan has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Duncan by Decade
How has Duncan tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Duncan by State
Birth registrations for Duncan span all 47 states and territories in the SSA database. The highest counts are in California, New York, Texas. The lowest are in Wyoming, North Dakota, Hawaii. On average, about 320 Duncans were registered per state.
Duncan + Last Name Combinations
How many people share a full name with Duncan as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Duncan
Other first names starting with D with a similar number of bearers.
Duncan: Questions and Answers
How many people in the U.S. are named Duncan?
We estimate approximately 17,392 people named Duncan are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 19,708 Americans share this first name.
Is Duncan a common name?
Duncan is classified as "Uncommon" and is more popular than 98.4% of all first names in the SSA database. A total of 21,043 births have been registered with this name since 1880.
When was Duncan most popular?
Duncan reached peak popularity in 1997, when 644 babies were given this name. The average age of a living person named Duncan is approximately 34 years old, reflecting when the name was most commonly given.
Is Duncan a male name?
Duncan is predominantly male. 99.9% of people with this name are male. See the gender breakdown above for full details.
How many Duncan Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Duncan Smith, Duncan Johnson, Duncan Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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