Iain is a distinctive boys' name in United States, ranking #4384 in 2023 with 24 recorded births. The name reached its all-time peak in 2003 with 126 births ranking #1181. Since 1996, the popularity has decreased by 72.1%. In 2023, approximately 1 in every 71,190 boys born was named Iain. FALLING Recent data shows the name is currently falling.