Isac is a distinctive boys' name in United States, ranking #1178 in 2003 with 127 recorded births. The name reached its all-time peak in 2006 with 148 births ranking #1147. Since 1996, the popularity has increased by 104.8%. In 2003, approximately 1 in every 15,553 boys born was named Isac. RISING Recent data shows the name is currently rising.