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).
Aya has been climbing in recent years. All-time it's been given to 12,801 U.S. babies, the 854th most common name by sound today, peaking at 758 in 2025, with 758 in 2025.
By sound, Aya also includes the spellings Ayah.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).