Lain is a distinctive boys' name in United States, ranking #4053 in 2011 with 25 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 127.3%. In 2011, approximately 1 in every 75,960 boys born was named Lain. RISING Recent data shows the name is currently rising.