Over the past 110 years, 35 944 boys and 14 girls have been named Sylvester. The name Sylvester ranks 541th in the United States among the most common names for boys. For the first time more than ten times newborns were named Sylvester in 1910. The peak of popularity of the name Sylvester 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.