Klein is a distinctive boys' name in United States, ranking #8104 in 2002 with 8 recorded births. The name reached its all-time peak in 2013 with 25 births ranking #4017. Since 1996, the popularity has increased by 14.3%. In 2002, approximately 1 in every 242,684 boys born was named Klein. STABLE Recent data shows the name is currently stable.