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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).
Christopher
Christopher has dropped sharply from its peak but is still widely used. All-time it's been given to 2,177,615 U.S. babies, the 110th most common name by sound today, peaking at 63,115 in 1984, with 5,135 in 2025.
By sound, Christopher also includes the spellings Kristopher, Cristopher, Kristofer, Kristoffer, Christofer, Christoper, Khristopher.
Rising