Lain is a distinctive boys' name in United States, ranking #8126 in 2002 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 2002, approximately 1 in every 242,684 boys born was named Lain. RISING Recent data shows the name is currently rising.