Lain is a distinctive boys' name in United States, ranking #6022 in 2025 with 15 recorded births. The name reached its all-time peak in 2011 with 25 births ranking #4053. Since 1996, the popularity has increased by 36.4%. In 2025, approximately 1 in every 113,872 boys born was named Lain. RISING Recent data shows the name is currently rising.