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).
Anna
Anna is down from its peak but still widely used. All-time it's been given to 917,615 U.S. babies, the 271st most common name by sound today, peaking at 15,697 in 1918, with 2,521 in 2025.
Anna has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).