Klein is a distinctive boys' name in United States, ranking #5953 in 2017 with 15 recorded births. The name reached its all-time peak in 2013 with 25 births ranking #4017. Since 1996, the popularity has increased by 114.3%. In 2017, approximately 1 in every 123,354 boys born was named Klein. STABLE Recent data shows the name is currently stable.