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).
Emelia has stayed fairly steady in American naming for generations. All-time it's been given to 17,066 U.S. babies, the 846th most common name by sound today, peaking at 851 in 2019, with 646 in 2025.
By sound, Emelia also includes the spellings Amilia. Spellings sometimes heard the same way: Amelia, Emilia.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).