Cai is a moderately popular boys' name in England & Wales, ranking #324 in 1998 with 77 recorded births. The name reached its all-time peak in 2006 with 192 births ranking #214. Since 1996, the popularity has increased by 67.4%. In 1998, approximately 1 in every 4,032 boys born was named Cai. RISING Recent data shows the name is currently rising.