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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 is now well below its former popularity. All-time it's been given to 520,135 U.S. babies, the 970th most common name by sound today, peaking at 52,400 in 1989, with 464 in 2025.
By sound, Brittany also includes the spellings Brittney, Britney, Brittani, Britany, Brittni, Brittanie, Britni, Brittny, Brittaney.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).