Lou is a distinctive boys' name in United States, ranking #4136 in 2013 with 24 recorded births. The name reached its all-time peak in 2025 with 81 births ranking #1929. Since 1996, the popularity has increased by 71.4%. In 2013, approximately 1 in every 78,802 boys born was named Lou. STABLE Recent data shows the name is currently stable.