Kei is a distinctive boys' name in United States, ranking #5287 in 2001 with 14 recorded births. This places Kei in the top 43% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2015 with 33 births ranking #3401. Since 1996, the popularity has increased by 180.0%. In 2001, approximately 1 in every 138,774 boys born was named Kei. FALLING Recent data shows the name is currently falling.