Lou is a distinctive boys' name in United States, ranking #6631 in 2008 with 13 recorded births. This places Lou in the top 45% 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. In 2008, approximately 1 in every 156,919 boys born was named Lou. STABLE Recent data shows the name is currently stable.