Iason is a distinctive boys' name in United States, ranking #12963 in 2012 with 5 recorded births. This places Iason in the bottom 9% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2013 with 9 births ranking #8360. In 2012, approximately 1 in every 379,325 boys born was named Iason. RISING Recent data shows the name is currently rising.