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).
Gianna is one of the fastest-rising names in America right now. All-time it's been given to 125,125 U.S. babies, the 82nd most common name by sound today, peaking at 8,540 in 2020, with 6,181 in 2025.
By sound, Gianna also includes the spellings Giana, Jianna.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).