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).
Solomon has stayed fairly steady in American naming for generations. All-time it's been given to 41,944 U.S. babies, the 775th most common name by sound today, peaking at 977 in 2016, with 859 in 2025.
By sound, Solomon also includes the spellings Salomon.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).