Cai is a moderately popular boys' name in England & Wales, ranking #289 in 2008 with 145 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 215.2%. In 2008, approximately 1 in every 2,341 boys born was named Cai. RISING Recent data shows the name is currently rising.