Isac is a distinctive boys' name in United States, ranking #1211 in 2004 with 126 recorded births. This places Isac in the top 9% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2006 with 148 births ranking #1147. Since 1996, the popularity has increased by 103.2%. In 2004, approximately 1 in every 15,752 boys born was named Isac. RISING Recent data shows the name is currently rising.