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).
Cynthia
Cynthia was more common in the past and has since settled at a lower, steady level. All-time it's been given to 721,984 U.S. babies, the 1,381st most common name by sound today, peaking at 39,559 in 1957, with 267 in 2025.
By sound, Cynthia also includes the spellings Cinthia, Synthia.
Rising