Sidonia has been given to about 398 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 13 babies were given the name, ranking 2658th. The typical living American called Sidonia is about 64 years old today.
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.