Kain is a distinctive boys' name in United States, ranking #1301 in 2003 with 108 recorded births. The name reached its all-time peak in 2016 with 180 births ranking #1093. Since 1996, the popularity has increased by 28.6%. In 2003, approximately 1 in every 18,290 boys born was named Kain. STABLE Recent data shows the name is currently stable.