Kai is a popular boys' name in England & Wales, ranking #91 in 2021 with 639 recorded births. The name reached its all-time peak in 2010 with 1,308 births ranking #56. Since 1996, the popularity has increased by 201.4%. In 2021, approximately 1 in every 462 boys born was named Kai. STABLE Recent data shows the name is currently stable.