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).
Adelina has been climbing in recent years. All-time it's been given to 16,762 U.S. babies, the 733rd most common name by sound today, peaking at 1,007 in 2025, with 1,007 in 2025.
Adelina has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).