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).
Ada
Ada has been climbing back after years of decline. All-time it's been given to 111,491 U.S. babies, the 450th most common name by sound today, peaking at 1,999 in 1918, with 1,517 in 2025.
By sound, Ada also includes the spellings Adah, Aidah. Spellings sometimes heard the same way: Aida.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).