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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).
Nicholas
Nicholas has been easing down from its peak but is still widely used. All-time it's been given to 1,108,654 U.S. babies, the 102nd most common name by sound today, peaking at 33,171 in 1995, with 5,846 in 2025.
By sound, Nicholas also includes the spellings Nicolas, Nickolas, Nikolas, Nicklaus, Nicholaus, Nikolaus, Nicklas, Niklaus.
Rising