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).
Emily is down from its peak but still widely used. All-time it's been given to 985,686 U.S. babies, the 70th most common name by sound today, peaking at 28,944 in 1999, with 6,387 in 2025.
By sound, Emily also includes the spellings Emilie, Emilee, Emely, Emmalee, Emalee.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).