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).
Bella
Bella is down from its peak but still widely used. All-time it's been given to 83,766 U.S. babies, the 298th most common name by sound today, peaking at 5,144 in 2010, with 2,129 in 2025.
Bella has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).