Kain is a distinctive boys' name in United States, ranking #1738 in 2025 with 94 recorded births. The name reached its all-time peak in 2016 with 180 births ranking #1093. Since 1996, the popularity has increased by 11.9%. In 2025, approximately 1 in every 18,171 boys born was named Kain. STABLE Recent data shows the name is currently stable.