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).
Gerald is now well below its former popularity. All-time it's been given to 497,831 U.S. babies, the 1,656th most common name by sound today, peaking at 12,715 in 1942, with 194 in 2025.
By sound, Gerald also includes the spellings Jerald, Jerrold, Jerold, Gearld.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).