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).
Leo
Leo is one of the fastest-rising names in America right now — a comeback after years of decline. All-time it's been given to 262,124 U.S. babies, the 47th most common name by sound today, peaking at 8,325 in 2022, with 8,196 in 2025.
Leo has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).