Over the past 110 years, 196 girls and 197 283 boys have been named Leo. The name Leo ranks 6902th in the United States among the most common names for girls. For the first time more than ten times newborns were named Leo in 1910. The peak of popularity of the name Leo came in the 1910s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.