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).
Ana
Ana has stayed fairly steady in American naming for generations. All-time it's been given to 111,960 U.S. babies, the 520th most common name by sound today, peaking at 2,672 in 1991, with 1,276 in 2025.
Ana has no common alternate spellings by sound. Spellings sometimes heard the same way: Anna.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).