How Many People Are Named Kayin?
An estimated 614 people in the United States have the first name Kayin. It is used for both genders, with 86.8% male. The average bearer is 19 years old, and Kayin peaked in popularity in 2005 with 39 births that year.
Below you will find a full statistical profile of Kayin 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 Kayin paired with any surname.
Estimated Living Americans
614
About 1 in 558,232 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
86.8% confidence
Average Age
19
years old
Peak Year
2005
39 births
Total Registered
622
since 1880
Gender Distribution for Kayin
Kayin is predominantly male (86.8%), though 82 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Kayin as a male name
Ranked #7,517 in 2023
11 male births in 2023
Peak: 2001 (31 births)
Kayin as a female name
Ranked #11,694 in 2023
8 female births in 2023
Peak: 2005 (11 births)
Kayin: Popularity Over Time
SSA records for Kayin span from the 1970s to the 2020s, covering 5 decades of naming data. The most popular decade for this name was the 2000s, when 306 babies were registered. Kayin has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Kayin by Decade
How has Kayin 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.
Kayin by State
Kayin + Last Name Combinations
How many people share a full name with Kayin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kayin
Other first names starting with K with a similar number of bearers.
Kayin: Questions and Answers
How many people in the U.S. are named Kayin?
We estimate approximately 614 people named Kayin 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 558,232 Americans share this first name.
Is Kayin a common name?
Kayin is classified as "Very Rare" and is more popular than 86.4% of all first names in the SSA database. A total of 622 births have been registered with this name since 1880.
When was Kayin most popular?
Kayin reached peak popularity in 2005, when 39 babies were given this name. The average age of a living person named Kayin is approximately 19 years old, reflecting when the name was most commonly given.
Is Kayin a male name?
Kayin is predominantly male. 86.8% of people with this name are male. See the gender breakdown above for full details.
How many Kayin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kayin Smith, Kayin Johnson, Kayin 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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