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).
Alonzo
Alonzo has stayed fairly steady in American naming for generations. All-time it's been given to 46,109 U.S. babies, the 952nd most common name by sound today, peaking at 651 in 2022, with 590 in 2025.
Alonzo has no common alternate spellings by sound.
Rising