How to read the band →
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).
Isabella
Isabella is down from its peak but still widely used. All-time it's been given to 461,301 U.S. babies, the 13th most common name by sound today, peaking at 25,731 in 2010, with 11,624 in 2025.
By sound, Isabella also includes the spellings Izabella, Isabela.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).