Isaah is a distinctive boys' name in United States, ranking #4665 in 2004 with 18 recorded births. This places Isaah in the top 35% 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. In 2004, approximately 1 in every 110,267 boys born was named Isaah. FALLING Recent data shows the name is currently falling.