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).
Leon
Leon has been climbing back after years of decline. All-time it's been given to 184,074 U.S. babies, the 301st most common name by sound today, peaking at 2,714 in 1924, with 2,583 in 2025.
Leon has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).