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).
Gabriella is down from its peak but still widely used. All-time it's been given to 224,257 U.S. babies, the 200th most common name by sound today, peaking at 8,716 in 2007, with 3,506 in 2025.
By sound, Gabriella also includes the spellings Gabriela.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).