Lou is a distinctive boys' name in United States, ranking #5633 in 2010 with 16 recorded births. This places Lou in the top 39% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 81 births ranking #1929. Since 1996, the popularity has increased by 14.3%. In 2010, approximately 1 in every 119,901 boys born was named Lou. STABLE Recent data shows the name is currently stable.