Lain is a distinctive boys' name in United States, ranking #6991 in 1997 with 8 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has decreased by 27.3%. In 1997, approximately 1 in every 235,636 boys born was named Lain. RISING Recent data shows the name is currently rising.