Sidney has been given to about 108,987 people in the United States since 1880. It was most common in 1918, which makes it a Edwardian name.
Its best year was 1918, when 1,939 babies were given the name, ranking 927th. The typical living American called Sidney is about 48 years old today. It is relatively most common in New York, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.