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).
Charlotte has climbed over the years and is holding near its high. All-time it's been given to 462,100 U.S. babies, the 9th most common name by sound today, at an all-time high of 13,522 in 2025.
By sound, Charlotte also includes the spellings Charlette, Charolette.