How Many People Are Named Kj?
An estimated 215 people in the United States have the first name Kj. It is almost exclusively a male name. The average bearer is 11 years old, and Kj peaked in popularity in 2021 with 21 births that year.
Below you will find a full statistical profile of Kj 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 Kj paired with any surname.
Estimated Living Americans
215
About 1 in 1,594,206 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
11
years old
Peak Year
2021
21 births
Total Registered
217
since 1880
Gender Distribution for Kj
Kj is almost exclusively a male name. Out of 217 total births registered, 100.0% were male.
Kj as a male name
Ranked #5,547 in 2024
17 male births in 2024
Peak: 2021 (21 births)
Kj: Popularity Over Time
SSA records for Kj span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 98 babies were registered. While Kj is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Kj by Decade
How has Kj 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.
Kj + Last Name Combinations
How many people share a full name with Kj as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kj
Other first names starting with K with a similar number of bearers.
Kj: Questions and Answers
How many people in the U.S. are named Kj?
We estimate approximately 215 people named Kj 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 1,594,206 Americans share this first name.
Is Kj a common name?
Kj is classified as "Very Rare" and is more popular than 75.1% of all first names in the SSA database. A total of 217 births have been registered with this name since 1880.
When was Kj most popular?
Kj reached peak popularity in 2021, when 21 babies were given this name. The average age of a living person named Kj is approximately 11 years old, reflecting when the name was most commonly given.
Is Kj a male name?
Kj is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Kj Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kj Smith, Kj Johnson, Kj 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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