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).
Nyla has climbed over the years and is holding near its high. All-time it's been given to 49,536 U.S. babies, the 352nd most common name by sound today, peaking at 2,607 in 2019, with 2,133 in 2025.
By sound, Nyla also includes the spellings Nylah, Nailah, Naila. Spellings sometimes heard the same way: Nila, Nayla.