Lain is a distinctive boys' name in United States, ranking #4476 in 2012 with 22 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 100.0%. In 2012, approximately 1 in every 86,210 boys born was named Lain. RISING Recent data shows the name is currently rising.