Lain is a distinctive boys' name in United States, ranking #6074 in 2005 with 13 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 18.2%. In 2005, approximately 1 in every 153,627 boys born was named Lain. RISING Recent data shows the name is currently rising.