How Many People Are Named Kolby?
An estimated 12,578 people in the United States have the first name Kolby. It is used for both genders, with 89.8% male. The average bearer is 22 years old, and Kolby peaked in popularity in 2001 with 781 births that year.
Below you will find a full statistical profile of Kolby 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 Kolby paired with any surname.
Estimated Living Americans
12,578
About 1 in 27,250 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
89.8% confidence
Average Age
22
years old
Peak Year
2001
781 births
Total Registered
12,792
since 1880
Gender Distribution for Kolby
Kolby is predominantly male (89.8%), though 1,308 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Kolby as a male name
Ranked #1,268 in 2024
155 male births in 2024
Peak: 2001 (739 births)
Kolby as a female name
Ranked #3,916 in 2024
38 female births in 2024
Peak: 2000 (55 births)
Kolby: Popularity Over Time
SSA records for Kolby span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2000s, when 5,054 babies were registered. Kolby has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Kolby by Decade
How has Kolby 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.
Kolby by State
Birth registrations for Kolby span all 46 states and territories in the SSA database. The highest counts are in Texas, California, Utah. The lowest are in Nevada, New Jersey, South Dakota. On average, about 201 Kolbys were registered per state.
Kolby + Last Name Combinations
How many people share a full name with Kolby as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kolby
Other first names starting with K with a similar number of bearers.
Kolby: Questions and Answers
How many people in the U.S. are named Kolby?
We estimate approximately 12,578 people named Kolby 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 27,250 Americans share this first name.
Is Kolby a common name?
Kolby is classified as "Uncommon" and is more popular than 98% of all first names in the SSA database. A total of 12,792 births have been registered with this name since 1880.
When was Kolby most popular?
Kolby reached peak popularity in 2001, when 781 babies were given this name. The average age of a living person named Kolby is approximately 22 years old, reflecting when the name was most commonly given.
Is Kolby a male name?
Kolby is predominantly male. 89.8% of people with this name are male. See the gender breakdown above for full details.
How many Kolby Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kolby Smith, Kolby Johnson, Kolby 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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