How to read the band →
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).
Rosalyn
Rosalyn climbed for decades and has been a steadily popular name ever since. All-time it's been given to 49,452 U.S. babies, the 911th most common name by sound today, peaking at 807 in 1956, with 602 in 2025.
By sound, Rosalyn also includes the spellings Roslyn, Rosaline, Rosalynn. Spellings sometimes heard the same way: Roselyn.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).