Over the past 110 years, 18 778 girls and 73 990 boys have been named Sidney. The name Sidney ranks 924th in the United States among the most common names for girls. For the first time more than ten times newborns were named Sidney in 1913. The peak of popularity of the name Sidney came in the 1990s and 2000s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.