Isai is a distinctive boys' name in United States, ranking #742 in 2003 with 243 recorded births. The name reached its all-time peak in 2007 with 333 births ranking #701. Since 1996, the popularity has increased by 63.1%. In 2003, approximately 1 in every 8,129 boys born was named Isai. STABLE Recent data shows the name is currently stable.