Sybil has been given to about 20,365 people in the United States since 1880. It was most common in 1921, which makes it a interwar name.
Its best year was 1921, when 541 babies were given the name, ranking 285th. The typical living American called Sybil is about 70 years old today. It is relatively most common in Maryland, 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.