Kain is a moderately popular boys' name in England & Wales, ranking #400 in 2002 with 57 recorded births. The name reached its all-time peak in 2001 with 64 births ranking #375. Since 1996, the popularity has increased by 137.5%. In 2002, approximately 1 in every 5,058 boys born was named Kain. FALLING Recent data shows the name is currently falling.