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).
Joanna
Joanna has been slowly declining from its former popularity. All-time it's been given to 177,500 U.S. babies, the 525th most common name by sound today, peaking at 4,427 in 1984, with 1,397 in 2025.
By sound, Joanna also includes the spellings Johanna, Joana, Johannah. Spellings sometimes heard the same way: Johana.
Rising