Isai is a distinctive boys' name in United States, ranking #1139 in 2025 with 186 recorded births. This places Isai in the top 8% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 333 births ranking #701. Since 1996, the popularity has increased by 24.8%. In 2025, approximately 1 in every 9,183 boys born was named Isai. STABLE Recent data shows the name is currently stable.