Kein is a distinctive boys' name in United States, ranking #11379 in 2006 with 6 recorded births. This places Kein in the bottom 19% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2002 with 6 births ranking #10072. In 2006, approximately 1 in every 342,520 boys born was named Kein. RISING Recent data shows the name is currently rising.