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).
Cheyenne is now well below its former popularity. All-time it's been given to 108,489 U.S. babies, the 1,080th most common name by sound today, peaking at 6,874 in 1997, with 377 in 2025.
By sound, Cheyenne also includes the spellings Cheyanne, Shyanne, Shyann, Shianne.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).