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).
Mae has stayed fairly steady in American naming for generations. All-time it's been given to 171,237 U.S. babies, the 786th most common name by sound today, peaking at 3,759 in 1918, with 832 in 2025.
By sound, Mae also includes the spellings May, Mai.