Baby Names US
Unisex name ★ peaked 2005

Kayin

Meaning Spelling variant of Kain Gender Unisex · 13% girls Rank 2025 #9,319

Spelling variant of Kain.

Rank 2025
#9,319
among boys
Babies in 2025
8
named Kayin
How common
1 in 213,510
boys born in 2025
Peak year
2005
39 babies
All-time total
630
#7,458 all-time among boys
First recorded
1977
in Social Security records

Kayin popularity over time

630 babies have been named Kayin since 1977, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.010.010.020.0218801900192019401960198020002020BoysGirls
BoysGirls

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Girls Boys Total Per year Change Best rank
1880s – – – – – –
1890s – – – – – –
1900s – – – – – –
1910s – – – – – –
1920s – – – – – –
1930s – – – – – –
1940s – – – – – –
1950s – – – – – –
1960s – – – – – –
1970s – 7 7 1 – #4,870
1980s – – – – – –
1990s – 79 79 8 – #3,232
2000s 45 261 306 31 +287% #2,964
2010s 22 154 176 18 -42% #4,325
2020s (to 2025) 15 47 62 10 -41% #7,509

The story of Kayin

Kayin is rare for boys in the United States, ranked #9,319 in 2025 with 8 babies given the name. It is currently declining compared with a decade ago.

Since 1977, 630 American babies have been named Kayin, about 87% boys and 13% girls, making it a genuinely unisex name. Its peak came in 2005, when 39 newborns received the name, the signature sound of the 2000s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Kayin stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Kayin?

The median living Kayin is about 18 years old; half are between 12 and 23. An estimated 600 people named Kayin are alive in the United States today.

median 18 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Kayin year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Girls Girls rank Boys Boys rank
2025 – – 8 #9,319
2024 – – – –
2023 8 #11,706 11 #7,522
2022 7 #12,897 11 #7,509
2021 – – 9 #8,518
2020 – – 8 #9,148
2019 – – 10 #7,936
2018 – – 11 #7,377
2017 – – 17 #5,409
2016 – – 23 #4,402
2015 – – 8 #9,165
2014 5 #17,869 10 #7,855
2013 7 #13,899 18 #5,076
2012 – – 23 #4,325
2011 5 #18,189 16 #5,561
2010 5 #18,417 18 #5,142
2009 – – 24 #4,218
2008 – – 31 #3,530
2007 5 #19,041 27 #3,844
2006 8 #12,977 25 #3,945
2005 11 #9,786 28 #3,492
2004 6 #15,092 30 #3,250
2003 – – 22 #3,910
2002 8 #11,633 22 #3,861
2001 7 #12,730 31 #2,964
2000 – – 21 #3,856
1995 – – – –
1990 – – – –
1985 – – – –
1980 – – – –
1975 – – – –
1970 – – – –
1965 – – – –
1960 – – – –
1955 – – – –
1950 – – – –
1945 – – – –
1940 – – – –
1935 – – – –
1930 – – – –
1925 – – – –
1920 – – – –
1915 – – – –
1910 – – – –
1905 – – – –
1900 – – – –
1895 – – – –
1890 – – – –
1885 – – – –
1880 – – – –

Frequently asked questions

Quick answers about Kayin, drawn from the same Social Security data as the charts above.

How old is the average Kayin?

The median living Kayin is about 18 years old. Half of all living Kayins are between 12 and 23 years old.

How many people named Kayin are alive today?

An estimated 600 people named Kayin are alive in the United States, based on 630 recorded births and Social Security life tables.

What does the name Kayin mean?

Spelling variant of Kain.

How popular is the name Kayin in 2025?

Kayin ranked #9,319 among boys' names in the United States in 2025, with 8 babies given the name, according to Social Security Administration data.

How many people are named Kayin?

630 babies have been named Kayin in the United States since 1977, based on Social Security card applications.

When was the name Kayin most popular?

Kayin peaked in 2005, when 39 newborns received the name.

Is Kayin a boy or girl name?

Kayin is used for both: about 13% of babies named Kayin have been girls and 87% boys.

Is the name Kayin rising or falling?

Kayin is declining, less popular now than a decade ago.

Names like Kayin

Names that sound and feel close to Kayin: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Kayin with similar names → More names starting with K →