Kain is a distinctive boys' name in England & Wales, ranking #628 in 2005 with 42 recorded births. The name reached its all-time peak in 2001 with 64 births ranking #375. Since 1996, the popularity has increased by 75.0%. In 2005, approximately 1 in every 7,368 boys born was named Kain. FALLING Recent data shows the name is currently falling.