Iain is a distinctive boys' name in United States, ranking #4127 in 2022 with 26 recorded births. The name reached its all-time peak in 2003 with 126 births ranking #1181. Since 1996, the popularity has decreased by 69.8%. In 2022, approximately 1 in every 67,091 boys born was named Iain. FALLING Recent data shows the name is currently falling.