Klein is a distinctive boys' name in United States, ranking #13138 in 2006 with 5 recorded births. The name reached its all-time peak in 2013 with 25 births ranking #4017. Since 1996, the popularity has decreased by 28.6%. In 2006, approximately 1 in every 411,024 boys born was named Klein. STABLE Recent data shows the name is currently stable.