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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).
Tonya
Tonya was more common in the past and has since settled at a lower, steady level. All-time it's been given to 281,585 U.S. babies, the 1,903rd most common name by sound today, peaking at 14,231 in 1974, with 144 in 2025.
By sound, Tonya also includes the spellings Tanya, Tania, Tonja, Tawnya, Tanja.
Rising