How Many People Are Named Kei?
An estimated 794 people in the United States have the first name Kei. It is used for both genders, with 77.4% male. The average bearer is 21 years old, and Kei peaked in popularity in 2015 with 40 births that year.
Below you will find a full statistical profile of Kei 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 Kei paired with any surname.
Estimated Living Americans
794
About 1 in 431,681 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
77.4% confidence
Average Age
21
years old
Peak Year
2015
40 births
Total Registered
823
since 1880
Gender Distribution for Kei
Kei is a genuinely unisex name, used for both males (77.4%) and females (22.6%). Out of 823 total births registered, 637 were male and 186 were female.
Kei as a male name
Ranked #4,624 in 2024
22 male births in 2024
Peak: 2015 (33 births)
Kei as a female name
Ranked #12,794 in 2023
7 female births in 2023
Peak: 1994 (12 births)
Kei: Popularity Over Time
SSA records for Kei span from the 1920s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2010s, when 254 babies were registered. While Kei is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Kei by Decade
How has Kei 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.
Kei by State
Kei + Last Name Combinations
How many people share a full name with Kei as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kei
Other first names starting with K with a similar number of bearers.
Kei: Questions and Answers
How many people in the U.S. are named Kei?
We estimate approximately 794 people named Kei 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 431,681 Americans share this first name.
Is Kei a common name?
Kei is classified as "Very Rare" and is more popular than 88.5% of all first names in the SSA database. A total of 823 births have been registered with this name since 1880.
When was Kei most popular?
Kei reached peak popularity in 2015, when 40 babies were given this name. The average age of a living person named Kei is approximately 21 years old, reflecting when the name was most commonly given.
Is Kei a male name?
Kei is predominantly male. 77.4% of people with this name are male. See the gender breakdown above for full details.
How many Kei Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kei Smith, Kei Johnson, Kei 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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