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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).
Brittany
Brittany was more common in the past and has since settled at a lower, steady level. All-time it's been given to 525,258 U.S. babies, the 986th most common name by sound today, peaking at 52,907 in 1989, with 464 in 2025.
By sound, Brittany also includes the spellings Brittney, Britney, Brittani, Britany, Brittni, Brittanie, Britni, Brittny, Brittaney, Brittnee, Brittnie.
Rising