Iain is a moderately popular boys' name in England & Wales, ranking #471 in 1999 with 44 recorded births. The name reached its all-time peak in 1996 with 76 births ranking #319. Since 1996, the popularity has decreased by 42.1%. In 1999, approximately 1 in every 6,892 boys born was named Iain. RISING Recent data shows the name is currently rising.