Rosalyn has been given to about 23,278 people in the United States since 1880. It was most common in 1955, which makes it a midcentury name.
Its best year was 1955, when 422 babies were given the name, ranking 431st. The typical living American called Rosalyn is about 54 years old today. It is relatively most common in Kentucky, where it accounts for 0.02% 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.