Isaah is a distinctive boys' name in United States, ranking #2968 in 1999 with 28 recorded births. This places Isaah in the top 26% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2001 with 34 births ranking #2761. Since 1996, the popularity has increased by 64.7%. In 1999, approximately 1 in every 68,575 boys born was named Isaah. FALLING Recent data shows the name is currently falling.