Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Rosalie has been climbing back after years of decline. All-time it's been given to 97,045 U.S. babies, the 391st most common name by sound today, peaking at 4,044 in 1938, with 2,067 in 2025.
By sound, Rosalie also includes the spellings Rosalee.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).