Isac is a distinctive boys' name in United States, ranking #1358 in 1999 with 88 recorded births. The name reached its all-time peak in 2006 with 148 births ranking #1147. Since 1996, the popularity has increased by 41.9%. In 1999, approximately 1 in every 21,819 boys born was named Isac. RISING Recent data shows the name is currently rising.