Cai is a moderately popular boys' name in England & Wales, ranking #349 in 2010 with 120 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 160.9%. In 2010, approximately 1 in every 2,885 boys born was named Cai. RISING Recent data shows the name is currently rising.