Isaah is a distinctive boys' name in United States, ranking #3758 in 1998 with 19 recorded births. The name reached its all-time peak in 2001 with 34 births ranking #2761. Since 1996, the popularity has increased by 11.8%. In 1998, approximately 1 in every 100,596 boys born was named Isaah. FALLING Recent data shows the name is currently falling.