Over the past 110 years, 14 girls and 35 944 boys have been named Sylvester. The name Sylvester ranks 14652th in the United States among the most common names for girls. For the first time more than ten times newborns were named Sylvester in 1926. The peak of popularity of the name Sylvester came in the 1920s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.