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).
Sharon was more common in the past and has since settled at a lower, steady level. All-time it's been given to 761,622 U.S. babies, the 1,830th most common name by sound today, peaking at 30,753 in 1947, with 179 in 2025.
By sound, Sharon also includes the spellings Sharron, Sharyn, Sharen, Sheron, Sherron.