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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).
Christy
Christy is now well below its former popularity. All-time it's been given to 365,578 U.S. babies, the 2,013th most common name by sound today, peaking at 17,413 in 1978, with 115 in 2025.
By sound, Christy also includes the spellings Kristi, Kristy, Christie, Kristie, Christi, Cristy, Cristi.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).