How Many People Are Named Kolby Williams?
There are approximately 66 people named Kolby Williams living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 5,193,248 Americans.
This estimate combines SSA birth records for the first name Kolby with Census Bureau frequency data for the surname Williams. Below you will find a breakdown of both names, including popularity trends, gender data, and Census background data where it is available.
Estimated People with This Name
66
1 in 5,193,248 Americans
Combination Rarity
Rare
First Name
View full profileKolby
Last Name
View full profileWilliams
Kolby: Popularity Over Time
Year-by-year SSA birth registrations for the first name Kolby. The peak year was 2001 with 781 births. The average person named Kolby today is 22 years old.
Ancestry of the First Name Kolby
In the 2020 Census, the first name Kolby was most commonly recorded among people who identified as White (79.13%). The next largest recorded groups were Black (8.17%) and Two or More Races (5.65%).
These percentages describe the people who had the first name Kolby in the 2020 Census. They do not tell you the deeper origin or meaning of the name itself.
Read this as a snapshot of who already had the name in 2020, not as a trend line. The SSA chart above is still the better way to see how Kolby rose or fell over time.
Ancestry of the Williams Surname
The surname Williams was most commonly recorded among people who identified as Black in the 2020 Census.
This is a self-reported race and ethnicity breakdown for people who had the surname Williams in the published Census surname tables. It gives useful context around who was recorded with the name, but it does not tell the full family history of every Boone line.
How we calculated this
The first name "Kolby" has an estimated frequency of < 0.0001% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Williams" appears at a rate of 522.38 per 100,000 people in the 2020 U.S. Census.
We do not use the Census first-name snapshot for the main estimate because it is only published once every 10 years. The latest public first-name Census file is from 2020, which is already 6 years old. SSA birth records plus CDC survival data give a better current estimate of how many people with the first name Kolby are likely to be alive now.
Multiplying these frequencies against the U.S. population of ~343 million gives 66 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Kolby
Other people with the surname Williams
Kolby Williams: Questions and Answers
How many people are named Kolby Williams?
We estimate approximately 66 people named Kolby Williams are alive in the United States today. The first name Kolby is shared by 12,578 Americans, and the surname Williams is shared by 1,790,492.
How rare is the name Kolby Williams?
This name combination is classified as Rare, occurring at a rate of about 1 in 5,193,248 Americans. The first name Kolby is uncommon and the surname Williams is very common.
Is Kolby a male or female name?
Kolby is predominantly male, with 89.8% of bearers being male and 10.2% female. It peaked in popularity in 2001 and the average bearer today is 22 years old.
What does the Census say about the first name Kolby?
In the 2020 Census, the first name Kolby was most commonly recorded among people who identified as White (79.13%). The next largest recorded groups were Black (8.17%) and Two or More Races (5.65%). These percentages describe the people who had the name in the 2020 Census, not the deeper origin of the name itself.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. When available, first-name Census background data comes from the 2020 U.S. Census Bureau first-name tables. Surname data comes from the 2020 U.S. Census Bureau. Full methodology.
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