Masculine dossier · first seen 1888
Colby
Stable
Cross-generational persistence
Peak era
2001
Peak births
3,859
Current vitality
Fragile
Peak generation
Gen Z
Quick answers about Colby
How many people are named Colby?
An estimated 52,230 living Americans are named Colby.
How rare is Colby?
Colby is uncommon among babies today, with 455 boys receiving the name in 2025, down 88.2% from its 2001 peak.
How old is the typical Colby?
The median age of a living American named Colby is approximately 25 years, with most bearers falling between 19 and 34 years old.
Is Colby still popular?
Yes. Colby is holding steady, with 455 births in 2025 and a consistent recent baseline.
Where is Colby most common?
Colby has its strongest geographic signal in New Hampshire, where it appears 10.1× more often than the national baseline.
1888Peak 20012025
Peak year
2001
Decline from peak
88.2%
2025
455
All-time
53,971
Where it lives now
Colby is most concentrated in New Hampshire — about 10.1× the national rate in the 2020s.
States where Colby is given more often than the national average — its present-day heartland.