How Many People Are Named Colby?
An estimated 55,946 people in the United States have the first name Colby. It is predominantly male (92.8%). The average bearer is 27 years old, and Colby peaked in popularity in 2001 with 3,979 births that year.
Below you will find a full statistical profile of Colby 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 Colby paired with any surname.
Estimated Living Americans
55,946
About 1 in 6,127 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
92.8% confidence
Average Age
27
years old
Peak Year
2001
3,979 births
Total Registered
57,635
since 1880
Gender Distribution for Colby
Colby is predominantly male (92.8%), though 4,123 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Colby as a male name
Ranked #582 in 2024
489 male births in 2024
Peak: 2001 (3,859 births)
Colby as a female name
Ranked #3,225 in 2024
49 female births in 2024
Peak: 1992 (155 births)
Colby: Popularity Over Time
SSA records for Colby span from the 1880s to the 2020s, covering 13 decades of naming data. The most popular decade for this name was the 2000s, when 20,040 babies were registered. Colby has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Colby by Decade
How has Colby 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.
Colby by State
Birth registrations for Colby span all 50 states and territories in the SSA database. The highest counts are in Texas, California, Florida. The lowest are in Alaska, North Dakota, Wyoming. On average, about 1,051 Colbys were registered per state.
Colby + Last Name Combinations
How many people share a full name with Colby as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Colby
Other first names starting with C with a similar number of bearers.
Colby: Questions and Answers
How many people in the U.S. are named Colby?
We estimate approximately 55,946 people named Colby 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 6,127 Americans share this first name.
Is Colby a common name?
Colby is classified as "Uncommon" and is more popular than 99.2% of all first names in the SSA database. A total of 57,635 births have been registered with this name since 1880.
When was Colby most popular?
Colby reached peak popularity in 2001, when 3,979 babies were given this name. The average age of a living person named Colby is approximately 27 years old, reflecting when the name was most commonly given.
Is Colby a male name?
Colby is predominantly male. 92.8% of people with this name are male. See the gender breakdown above for full details.
How many Colby Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Colby Smith, Colby Johnson, Colby 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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