How to read the band →
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).
Mckinley
Mckinley is now well below its former popularity. All-time it's been given to 22,884 U.S. babies, the 1,106th most common name by sound today, peaking at 934 in 2014, with 423 in 2025.
Mckinley has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).