Lou is a distinctive boys' name in United States, ranking #6169 in 2000 with 11 recorded births. The name reached its all-time peak in 2025 with 81 births ranking #1929. Since 1996, the popularity has decreased by 21.4%. In 2000, approximately 1 in every 178,539 boys born was named Lou. STABLE Recent data shows the name is currently stable.