Cai is a moderately popular boys' name in England & Wales, ranking #233 in 2003 with 138 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 200.0%. In 2003, approximately 1 in every 2,171 boys born was named Cai. RISING Recent data shows the name is currently rising.