Isai is a distinctive boys' name in United States, ranking #738 in 2005 with 274 recorded births. The name reached its all-time peak in 2007 with 333 births ranking #701. Since 1996, the popularity has increased by 83.9%. In 2005, approximately 1 in every 7,289 boys born was named Isai. STABLE Recent data shows the name is currently stable.