An estimated 11,438 living Americans are named Kolby.
How rare is Kolby?
Kolby is uncommon among babies today, with 165 boys receiving the name in 2025, down 77.7% from its 2001 peak.
How old is the typical Kolby?
The median age of a living American named Kolby is approximately 22 years, with most bearers falling between 15 and 28 years old.
Is Kolby still popular?
Yes. Kolby is holding steady, with 165 births in 2025 and a consistent recent baseline.
Where is Kolby most common?
Kolby has its strongest geographic signal in Utah, where it appears 10.6× more often than the national baseline.
1968Peak 20012025
Peak year
2001
Decline from peak
77.7%
2025
165
All-time
11,650
Diaspora map
Kolby spread fast — broke out in Alabama, Arkansas, Hawaii, Idaho, Iowa, Kansas, Louisiana, Maine, Mississippi, Missouri, Montana, Nebraska, North Dakota, Oklahoma, Tennessee, Utah, Washington, and West Virginia (2001) and ran high in 22 states within a decade.
Broke out: Alabama, Arkansas, Hawaii, Idaho, Iowa, Kansas, Louisiana, Maine, Mississippi, Missouri, Montana, Nebraska, North Dakota, Oklahoma, Tennessee, Utah, Washington, and West Virginia, 2001 · over-represented in 22 states over 1 year
