Klay is a distinctive boys' name in England & Wales, ranking #731 in 2018 with 46 recorded births. The name reached its all-time peak in 2017 with 47 births ranking #730. Since 1996, the popularity has increased by 1,050.0%. In 2018, approximately 1 in every 6,796 boys born was named Klay. FALLING Recent data shows the name is currently falling.