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).
Hazel is one of the fastest-rising names in America right now — a comeback after years of decline. All-time it's been given to 305,469 U.S. babies, the 90th most common name by sound today, peaking at 7,680 in 1918, with 6,342 in 2025.
Hazel has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).