MallowbyNames

Kayin

KAY-in · Of uncertain origin; possibly a modern invented name or variant of Kayan or Cayan.

2025 rank (boys)
#8,910
Babies named in 2025
8
Peak popularity
2001
2025 frequency
1 in 213,510 boys
Usually for
Boys
Trend
Declining since 2005

Declining since 2005, #8,910 for boys today.

Popularity of Kayin since 1977

Babies named Kayin per year in U.S. Social Security records.

102131198020002020Most births 2001GirlsBoys
GirlsBoys
Data table (by decade)
DecadeGirlsBoys
1970s07
1980s00
1990s079
2000s45261
2010s22154
2020s1547

Meaning & origin

Kayin is a modern American name first recorded in 1977, reflecting the trend of invented or creatively respelled names in the late 20th and early 21st centuries. It achieved its highest popularity in 2001, ranking that year as the 8,910th most common name for boys. The name has been declining in use since 2005, indicating a shift away from this particular coinage. While Kayin saw some use across the United States, it did not concentrate in any particular state, suggesting broad but low-level adoption. Its etymology remains uncertain, as it does not clearly derive from any established naming tradition, and may be a variation of similar-sounding names or an independent invention.

Kayin is a modern American coinage, first recorded in 1977. It may have been influenced by similar-sounding names like Kyan or Cayden, or derived from the Kayin people of Myanmar, though this connection is speculative. The name saw modest use in the United States, peaking in 2001 and declining thereafter.

Nicknames & variants

Nicknames: Kai

Variants: Kayan, Cayan

Sibling names for Kayin

Names that share Kayin's style, for a brother or sister.

Sisters: Maya, Leila, Zara, Naya, Kaia

Brothers: Kael, Jaden, Ethan, Liam, Noah

A parent animal hugging its little one, the personalized name page

K is for Kayin, our favorite little boy.

K is for Kayin…”

In a Mallowby alphabet book, Kayin's letter becomes Kayin's page: hand-illustrated, printed hardcover or paperback, made just for them.

Make Kayin's book

Books for siblings or grandkids? The second book is 15% off.

Questions parents ask

What does the name Kayin mean?
The meaning of Kayin is uncertain. It is a modern American name with no clear origin or established definition.
How popular is the name Kayin?
Kayin was ranked 8,910 in the United States in 2025, with about 1 in 213,510 male newborns receiving the name that year. Its popularity peaked in 2001 and has been declining since 2005.
Is Kayin a boy or girl name?
Kayin is primarily used as a boy's name, as indicated by the Social Security Administration data.