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).
Adelaide
Adelaide has stayed fairly steady in American naming for generations. All-time it's been given to 35,007 U.S. babies, the 616th most common name by sound today, peaking at 1,240 in 2016, with 1,062 in 2025.
Adelaide has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).