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).
Grant has been slowly declining from its former popularity. All-time it's been given to 136,669 U.S. babies, the 485th most common name by sound today, peaking at 3,315 in 1997, with 1,555 in 2025.
Grant has no common alternate spellings by sound.