Lain is a distinctive boys' name in United States, ranking #5088 in 2013 with 18 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 63.6%. In 2013, approximately 1 in every 105,070 boys born was named Lain. RISING Recent data shows the name is currently rising.