Iain is a distinctive boys' name in England & Wales, ranking #515 in 2000 with 38 recorded births. The name reached its all-time peak in 1996 with 76 births ranking #319. Since 1996, the popularity has decreased by 50.0%. In 2000, approximately 1 in every 7,715 boys born was named Iain. RISING Recent data shows the name is currently rising.