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).
Marshall
Marshall has stayed fairly steady in American naming for generations. All-time it's been given to 104,163 U.S. babies, the 705th most common name by sound today, peaking at 1,334 in 1947, with 1,011 in 2025.
By sound, Marshall also includes the spellings Marshal.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).