Kain is a moderately popular boys' name in England & Wales, ranking #437 in 1998 with 48 recorded births. The name reached its all-time peak in 2001 with 64 births ranking #375. Since 1996, the popularity has increased by 100.0%. In 1998, approximately 1 in every 6,468 boys born was named Kain. FALLING Recent data shows the name is currently falling.