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, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. 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 in the 2020 Census
The 2020 Census recorded 634 people with the first name Kayin, which placed it at #17,418 in the published first-name tables. This is a snapshot of people who already had the name in 2020. The estimated living count elsewhere on this page is different: it is a current estimate built from SSA birth records and age-based survival rates, so the two figures are not expected to match exactly.
Read this section as a snapshot of people who already had the name in 2020. The SSA charts elsewhere on this page are still the better way to see how the name rose, fell, or shifted across generations.
Gender in the 2020 Census
In the 2020 Census, Kayin was recorded as predominantly male. Out of 634 people with this name in that snapshot, 76.7% were male and 23.3% were female. That is less heavily male than the long-run SSA birth pattern on this page, which sits at 86.8% male.
Census Count
634
people with this name
Census Rank
#17,418
among Census first names
Frequency Rate
0.21
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Kayin was most commonly recorded among people who identified as Black (50.55%). The next largest recorded groups were White (17.90%) and Two or More Races (13.19%).
These percentages describe the people who had the first name Kayin in the 2020 Census. They do not tell you the deeper meaning or origin of the name itself.
2020 Census demographic breakdown
Each row shows a recorded Census category for people with the first name Kayin.
| Group | Share | Count |
|---|---|---|
| Black | 50.55% | 322 |
| White | 17.90% | 114 |
| Two or More Races | 13.19% | 84 |
| Asian and Pacific Islander | 10.05% | 64 |
| Hispanic | 7.69% | 49 |
| American Indian and Alaska Native | 0.63% | 4 |
The Census published separate sex and race/origin tables for first names, so their total counts can differ slightly for the same name. That is why the race section focuses on the demographic mix rather than repeating a second headline count.
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.
How common was Kayin in the 2020 Census?
The 2020 Census recorded 634 people with the first name Kayin. That placed it at #17,418 in the published Census first-name tables, or 0.21 people per 100,000.
Why is the Census count different from the living estimate?
Because they measure different things. The Census number is a count of people with the name in 2020. The living estimate is a current model based on SSA birth records and survival rates, so it aims to estimate how many people with the name are alive now.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Kayin was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
What does the Census say about the gender split for Kayin?
In the 2020 Census snapshot, Kayin was recorded as predominantly male. The published split was 76.7% male and 23.3% female.
What does the Census say about the background of people named Kayin?
In the 2020 Census, the first name Kayin was most commonly recorded among people who identified as Black (50.55%). The next largest recorded groups were White (17.90%) and Two or More Races (13.19%). These percentages describe the people who had the name in the 2020 Census, not the deeper meaning or origin of the name itself.
Why can the Census sex total and race total differ slightly?
The Census published separate first-name tables for sex and for race and Hispanic origin. Those totals can differ slightly for the same name, so the page uses them as two related snapshots rather than treating them as perfectly interchangeable counts.
Does every first name have Census demographic data?
No. The public Census first-name tables only include names that met the Bureau's publication rules. That means some names on this site will have SSA history but no published Census demographic snapshot.
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.
Why can Kayin have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Kayin peaked in 2005, and the average living bearer is about 19 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
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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