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).
Jayla has fallen well below its former popularity. All-time it's been given to 62,484 U.S. babies, the 643rd most common name by sound today, peaking at 4,074 in 2006, with 775 in 2025.
By sound, Jayla also includes the spellings Jaylah, Jaela, Jaila.