Masculine dossier · first seen 1880
Duncan
Stable
Cross-generational persistence
Peak era
1997
Peak births
644
Current vitality
Fragile
Peak generation
Gen Z
Quick answers about Duncan
How many people are named Duncan?
An estimated 16,856 living Americans are named Duncan.
How rare is Duncan?
Duncan is uncommon among babies today, with 190 boys receiving the name in 2025, down 70.5% from its 1997 peak.
How old is the typical Duncan?
The median age of a living American named Duncan is approximately 27 years, with most bearers falling between 17 and 40 years old.
Is Duncan still popular?
Yes. Duncan is holding steady, with 190 births in 2025 and a consistent recent baseline.
Where is Duncan most common?
Duncan has its strongest geographic signal in Massachusetts, where it appears 3.8× more often than the national baseline.
1880Peak 19972025
Peak year
1997
Decline from peak
70.5%
2025
190
All-time
21,219
Where it lives now
Duncan is most concentrated in Utah — about 2.9× the national rate in the 2010s.
States where Duncan is given more often than the national average — its present-day heartland.