Iestyn is a distinctive boys' name in England & Wales, ranking #2269 in 2025 with 10 recorded births. The name reached its all-time peak in 2004 with 138 births ranking #237. Since 1996, the popularity has decreased by 56.5%. In 2025, approximately 1 in every 27,194 boys born was named Iestyn. FALLING Recent data shows the name is currently falling.