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).
Jeanette was more common in the past and has since settled at a lower, steady level. All-time it's been given to 277,774 U.S. babies, the 2,166th most common name by sound today, peaking at 4,409 in 1953, with 131 in 2025.
By sound, Jeanette also includes the spellings Jeannette, Janette, Jannette, Janett, Jennette.