Klein is a distinctive boys' name in United States, ranking #5415 in 2015 with 17 recorded births. The name reached its all-time peak in 2013 with 25 births ranking #4017. Since 1996, the popularity has increased by 142.9%. In 2015, approximately 1 in every 112,721 boys born was named Klein. STABLE Recent data shows the name is currently stable.