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).
Daniela is now well below its former popularity. All-time it's been given to 102,577 U.S. babies, the 423rd most common name by sound today, peaking at 4,250 in 2007, with 1,666 in 2025.
By sound, Daniela also includes the spellings Daniella.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).