How Many People Are Named Kaja?
An estimated 674 people in the United States have the first name Kaja. It is almost exclusively a female name. The average bearer is 23 years old, and Kaja peaked in popularity in 2009 with 25 births that year.
Below you will find a full statistical profile of Kaja 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 Kaja paired with any surname.
Estimated Living Americans
674
About 1 in 508,538 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
23
years old
Peak Year
2009
25 births
Total Registered
694
since 1880
Gender Distribution for Kaja
Kaja is almost exclusively a female name. Out of 694 total births registered, 100.0% were female.
Kaja as a female name
Ranked #6,251 in 2024
19 female births in 2024
Peak: 2009 (25 births)
Kaja: Popularity Over Time
SSA records for Kaja span from the 1950s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 175 babies were registered. While Kaja is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Kaja by Decade
How has Kaja 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.
Kaja by State
Kaja + Last Name Combinations
How many people share a full name with Kaja as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kaja
Other first names starting with K with a similar number of bearers.
Kaja: Questions and Answers
How many people in the U.S. are named Kaja?
We estimate approximately 674 people named Kaja 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 508,538 Americans share this first name.
Is Kaja a common name?
Kaja is classified as "Very Rare" and is more popular than 87.3% of all first names in the SSA database. A total of 694 births have been registered with this name since 1880.
When was Kaja most popular?
Kaja reached peak popularity in 2009, when 25 babies were given this name. The average age of a living person named Kaja is approximately 23 years old, reflecting when the name was most commonly given.
Is Kaja a female name?
Kaja is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Kaja Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kaja Smith, Kaja Johnson, Kaja 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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