Lou is a distinctive boys' name in United States, ranking #5169 in 2012 with 18 recorded births. This places Lou in the top 36% 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 28.6%. In 2012, approximately 1 in every 105,368 boys born was named Lou. STABLE Recent data shows the name is currently stable.