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).
Gracie was more common in the past and has since settled at a lower, steady level. All-time it's been given to 86,780 U.S. babies, the 555th most common name by sound today, peaking at 3,631 in 2007, with 1,370 in 2025.
By sound, Gracie also includes the spellings Gracey.