Cai is a distinctive girls' name in England & Wales, ranking #3382 in 2005 with 5 recorded births. The name reached its all-time peak in 2005 with 5 births ranking #3382. Since 1996, the popularity has increased by 66.7%. In 2005, approximately 1 in every 57,651 girls born was named Cai. STABLE Recent data shows the name is currently stable.