Kai is a popular boys' name in United States, ranking #70 in 2021 with 4,638 recorded births. The name reached its all-time peak in 2022 with 5,366 births ranking #59. Since 1996, the popularity has increased by 1,461.6%. In 2021, approximately 1 in every 377 boys born was named Kai. FALLING Recent data shows the name is currently falling.