Cai is a moderately popular boys' name in England & Wales, ranking #275 in 2007 with 146 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 217.4%. In 2007, approximately 1 in every 2,270 boys born was named Cai. RISING Recent data shows the name is currently rising.