Lain is a distinctive boys' name in United States, ranking #5381 in 2010 with 17 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 54.5%. In 2010, approximately 1 in every 112,848 boys born was named Lain. RISING Recent data shows the name is currently rising.