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).
Amelia is one of the fastest-rising names in America right now — a comeback after years of decline. All-time it's been given to 350,535 U.S. babies, the 3rd most common name by sound today, peaking at 17,903 in 2021, with 17,387 in 2025.
By sound, Amelia also includes the spellings Emilia.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).