Cybil has been given to about 593 people in the United States since 1880. It was most common in 1975, which makes it a boomer-era name.
Its best year was 1975, when 48 babies were given the name, ranking 1884th. The typical living American called Cybil is about 42 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.