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).
Jade has climbed over the years and is holding near its high. All-time it's been given to 118,217 U.S. babies, the 239th most common name by sound today, peaking at 3,996 in 2002, with 2,869 in 2025.
By sound, Jade also includes the spellings Jayde.