Over the past 110 years, 369 084 boys and 366 girls have been named Louis. The name Louis ranks 87th in the United States among the most common names for boys. For the first time more than ten times newborns were named Louis in 1910. The peak of popularity of the name Louis came in the 1910s and 1920s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.