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).
Gracelyn climbed for decades and has been a steadily popular name ever since. All-time it's been given to 29,185 U.S. babies, the 491st most common name by sound today, peaking at 2,007 in 2020, with 1,357 in 2025.
By sound, Gracelyn also includes the spellings Gracelynn.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).