Lou is a distinctive boys' name in United States, ranking #4526 in 2009 with 22 recorded births. This places Lou in the top 31% 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 57.1%. In 2009, approximately 1 in every 90,150 boys born was named Lou. STABLE Recent data shows the name is currently stable.