Iestyn is a moderately popular boys' name in England & Wales, ranking #237 in 2004 with 138 recorded births. This places Iestyn in the top 5% of ranked UK boys' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 2004 with 138 births ranking #237. Since 1996, the popularity has increased by 500.0%. In 2004, approximately 1 in every 2,235 boys born was named Iestyn. FALLING Recent data shows the name is currently falling.