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).
Corey has been slowly declining from its former popularity. All-time it's been given to 406,323 U.S. babies, the 552nd most common name by sound today, peaking at 17,302 in 1989, with 1,112 in 2025.
By sound, Corey also includes the spellings Cory, Kori, Kory, Cori, Korey, Corrie, Corie, Korie, Corry.