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).
Giovani has stayed fairly steady in American naming for generations. All-time it's been given to 31,718 U.S. babies, the 904th most common name by sound today, peaking at 1,501 in 2009, with 611 in 2025.
By sound, Giovani also includes the spellings Jovani, Jovanni, Jovanny, Jovany. Spellings sometimes heard the same way: Giovanni.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).