Over the past 110 years, 73 990 boys and 18 778 girls have been named Sidney. The name Sidney ranks 347th in the United States among the most common names for boys. For the first time more than ten times newborns were named Sidney in 1910. The peak of popularity of the name Sidney 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.