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).
Camilla climbed for decades and has been a steadily popular name ever since. All-time it's been given to 33,485 U.S. babies, the 625th most common name by sound today, peaking at 1,433 in 2019, with 981 in 2025.
By sound, Camilla also includes the spellings Kamilla.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).