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).
Emmy has been climbing in recent years. All-time it's been given to 31,323 U.S. babies, the 525th most common name by sound today, peaking at 1,485 in 2025, with 1,485 in 2025.
By sound, Emmy also includes the spellings Emmie, Emi, Emme.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).