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).
Bonnie
Bonnie has been climbing in recent years. All-time it's been given to 339,181 U.S. babies, the 873rd most common name by sound today, peaking at 10,432 in 1947, with 785 in 2025.
By sound, Bonnie also includes the spellings Bonny.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).