Isac is a distinctive boys' name in United States, ranking #1411 in 1998 with 81 recorded births. The name reached its all-time peak in 2006 with 148 births ranking #1147. Since 1996, the popularity has increased by 30.6%. In 1998, approximately 1 in every 23,597 boys born was named Isac. RISING Recent data shows the name is currently rising.