How to read the band →
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).
Grady
Grady has stayed fairly steady in American naming for generations. All-time it's been given to 53,215 U.S. babies, the 757th most common name by sound today, peaking at 1,203 in 2008, with 860 in 2025.
Grady has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).