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).
Joel
Joel has stayed fairly steady in American naming for generations. All-time it's been given to 282,250 U.S. babies, the 445th most common name by sound today, peaking at 4,661 in 1985, with 1,639 in 2025.
Joel has no common alternate spellings by sound.
Rising