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).
Jacoby
Jacoby has stayed fairly steady in American naming for generations. All-time it's been given to 23,360 U.S. babies, the 1,028th most common name by sound today, peaking at 1,232 in 2008, with 409 in 2025.
By sound, Jacoby also includes the spellings Jakobe, Jacobi, Jakobi.
Rising