Iestyn is a moderately popular boys' name in England & Wales, ranking #367 in 2006 with 93 recorded births. The name reached its all-time peak in 2004 with 138 births ranking #237. Since 1996, the popularity has increased by 304.3%. In 2006, approximately 1 in every 3,444 boys born was named Iestyn. FALLING Recent data shows the name is currently falling.