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).
Aniyah was more common in the past and has since settled at a lower, steady level. All-time it's been given to 83,398 U.S. babies, the 286th most common name by sound today, peaking at 4,479 in 2008, with 2,804 in 2025.
By sound, Aniyah also includes the spellings Aniya, Anaya, Anayah, Anaiah, Inaya, Aniah, Anaiya.