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).
Marilyn
Marilyn is now well below its former popularity. All-time it's been given to 395,854 U.S. babies, the 1,105th most common name by sound today, peaking at 12,514 in 1947, with 415 in 2025.
By sound, Marilyn also includes the spellings Marilynn, Marylin, Marylyn.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).