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).
Annabelle is now well below its former popularity. All-time it's been given to 107,986 U.S. babies, the 593rd most common name by sound today, peaking at 6,353 in 2014, with 1,092 in 2025.
By sound, Annabelle also includes the spellings Annabel, Anabel, Anabelle, Annabell.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).