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How Many People Are Named Colby?
Estimated people named Colby living in the U.S. today
55,713
Gender distribution
93% male · 7% female in SSA records.
Name scorecard
- Total U.S. births recorded (1880–2024): 57,635
- Peak year: 2001 (3,979 births)
- Estimated living today: 55,713
Colby by age group — who carries the name today?
Colby popularity over time (1880–2024)
Estimated living bearers by birth decade
About the name Colby
Colby has been recorded by the Social Security Administration since the 19th century dataset began. In total, 57,635 babies were given the name in the United States between 1880 and 2024. After adjusting each birth cohort for survival to today, an estimated 55,713 bearers are still living — roughly 1 in 6,135 Americans. The name's strongest decade shapes how old most Colbys you meet will be, which the age-group breakdown above shows directly. All figures are statistical estimates from public records; see our methodology for sources, the survival model, and the limits of the data (names given to fewer than five babies in a year are not published by the SSA).
Frequently asked questions
How many people are named Colby in the US?
An estimated 55,713 people named Colby are living in the United States today, based on SSA birth records from 1880 to 2024 adjusted for survival. That makes Colby rare — about 1 in 6,135 Americans.
Is Colby a boy or girl name?
In SSA records, Colby is 93% male and 7% female, so it is predominantly a male name.
When was Colby most popular?
Colby peaked in 2001, when 3,979 babies were given the name. Its current trend is declining compared with the previous decade.
How rare is the name Colby?
Colby ranks #841 of 104,819 first names recorded by the SSA, with a rarity score of 44 out of 100 (higher means rarer).