Lou is a distinctive boys' name in United States, ranking #7584 in 1999 with 8 recorded births. The name reached its all-time peak in 2025 with 81 births ranking #1929. Since 1996, the popularity has decreased by 42.9%. In 1999, approximately 1 in every 240,011 boys born was named Lou. STABLE Recent data shows the name is currently stable.