Kayin
- US rank
- #8,910
- Syllables
- 2
- Peak
- #2,931 in 2001
8 babies were named Kayin in the US in 2025. It has dropped 171 places in five years.
Save adds it to your list. Vote moves it up the top voted names.
US births per million girls, 2001–2025
US births per million boys, 1977–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Kayin you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 212,766 baby boys born in the US in 2025 was named Kayin, 8 babies in all. In a typical school of 500 kids, your Kayin would very likely be the only one.
- HistoryKayin first shows up in US birth records in 1977, the first year at least 5 babies got it. It has been in use for 48 years since.
- Best yearIt was far more popular in 2001, when it ranked #2,931. Today it's #8,910, so it could be due a comeback.
- Then vs nowKayin was 2.3× more common in 2000 than it is today. In 2000 it was given to about 1 in 93,458 baby boys; in 2025, about 1 in 212,766.
- TrendKayin has slipped 171 places over the last five years and now sits at #8,910. Good news if you want a familiar name that fewer kids will share.
About the name Kayin
Kayin is a boy name of Japanese origin. It has 5 letters and 2 syllables, starting with K and ending in “-yin”. US birth records list Kayin for boys from 1977 to 2025, in 32 of those 49 years. Its best year was 2001, when it ranked #2,931 among boy names. In 2025 it ranked #8,910, with 8 babies.
Origin:Japanese names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 2000s | 2.7 | 367,347 girls |
| 2010s | 1.2 | 806,452 girls |
| 2020s | 2.3 | 430,108 girls |
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1970s | 1.4 | 697,674 boys |
| 1990s | 4.1 | 242,131 boys |
| 2000s | 13 | 76,511 boys |
| 2010s | 8.2 | 122,249 boys |
| 2020s | 4.5 | 221,402 boys |
Other spellings of Kayin
More Japanese boy names
- Unisex name: Asa · healer
- Unisex name: Mars · god of war
- Unisex name: Namir · leopard
- Unisex name: Sora · sky
- Unisex name: Akira · bright, clear
- Boy name: Ken · handsome
- Unisex name: Kasim · divider
- Unisex name: Yuki · snow
Questions about the name Kayin
What is the origin of the name Kayin?
Kayin has Japanese roots in our records. Other Japanese names include Asa, Mars, Namir.
Is Kayin a boy or girl name?
Kayin is a boy name.
How popular is the name Kayin?
Kayin ranked #8,910 for US boys in 2025, given to 8 babies. Its best year was 2001 (#2,931).