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).
Fatima has stayed fairly steady in American naming for generations. All-time it's been given to 42,691 U.S. babies, the 661st most common name by sound today, peaking at 1,589 in 2007, with 1,022 in 2025.
By sound, Fatima also includes the spellings Fatimah.