Cai is a moderately popular boys' name in England & Wales, ranking #381 in 1999 with 59 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 28.3%. In 1999, approximately 1 in every 5,140 boys born was named Cai. RISING Recent data shows the name is currently rising.