Kayin is a distinctive boys' name in United States, ranking #5407 in 2017 with 17 recorded births. The name reached its all-time peak in 2001 with 31 births ranking #2964. Since 1996, the popularity has increased by 21.4%. In 2017, approximately 1 in every 108,842 boys born was named Kayin. FALLING Recent data shows the name is currently falling.