Kayin is a distinctive boys' name in United States, ranking #7517 in 2023 with 11 recorded births. The name reached its all-time peak in 2001 with 31 births ranking #2964. Since 1996, the popularity has decreased by 21.4%. In 2023, approximately 1 in every 155,323 boys born was named Kayin. FALLING Recent data shows the name is currently falling.