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).
Leonel has stayed fairly steady in American naming for generations. All-time it's been given to 27,072 U.S. babies, the 654th most common name by sound today, peaking at 1,084 in 2024, with 942 in 2025.
Leonel has no common alternate spellings by sound.