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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).
Nicole
Nicole has been slowly declining from its former popularity. All-time it's been given to 678,268 U.S. babies, the 640th most common name by sound today, peaking at 26,430 in 1985, with 948 in 2025.
By sound, Nicole also includes the spellings Nichole, Nikole, Nicolle, Nickole, Nicol.
Rising