Iestyn is a moderately popular boys' name in England & Wales, ranking #370 in 2001 with 65 recorded births. This places Iestyn in the top 9% 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 182.6%. In 2001, approximately 1 in every 4,428 boys born was named Iestyn. FALLING Recent data shows the name is currently falling.