Cai is a moderately popular boys' name in England & Wales, ranking #445 in 2015 with 91 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 97.8%. In 2015, approximately 1 in every 3,662 boys born was named Cai. RISING Recent data shows the name is currently rising.