Over the past 110 years, 379 916 boys and 2 337 girls have been named Billy. The name Billy ranks 81th in the United States among the most common names for boys. For the first time more than ten times newborns were named Billy in 1910. The peak of popularity of the name Billy came in the 1930s and 1940s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.