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).
Wade has stayed fairly steady in American naming for generations. All-time it's been given to 78,970 U.S. babies, the 670th most common name by sound today, peaking at 1,487 in 1959, with 996 in 2025.
By sound, Wade also includes the spellings Wayde.