Istvan is a distinctive boys' name in United States, ranking #9853 in 1997 with 5 recorded births. This places Istvan 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 2000 with 8 births ranking #7733. In 1997, approximately 1 in every 377,018 boys born was named Istvan. FALLING Recent data shows the name is currently falling.