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).
Grey
Grey has stayed fairly steady in American naming for generations. All-time it's been given to 12,950 U.S. babies, the 1,061st most common name by sound today, peaking at 656 in 2021, with 403 in 2025.
By sound, Grey also includes the spellings Gray.
Rising