Louis has been given to about 409,317 people in the United States since 1880. It was most common in 1921, which makes it a interwar name.
Louis ranks 249th among American boys in 2025, with 1,397 born that year. Its best year was 1921, when 7,296 babies were given the name, ranking 29th. The typical living American called Louis is about 66 years old today. It is relatively most common in Vermont, where it accounts for 0.27% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.