Isaih is a distinctive boys' name in United States, ranking #2603 in 2008 with 48 recorded births. This places Isaih in the top 18% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 74 births ranking #1521. In 2008, approximately 1 in every 42,499 boys born was named Isaih. FALLING Recent data shows the name is currently falling.