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).
Aisha has been climbing in recent years. All-time it's been given to 44,312 U.S. babies, the 638th most common name by sound today, peaking at 2,643 in 1991, with 1,178 in 2025.
By sound, Aisha also includes the spellings Iesha, Ayesha, Aysha.