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).
Kinley is now well below its former popularity. All-time it's been given to 26,555 U.S. babies, the 851st most common name by sound today, peaking at 2,142 in 2012, with 565 in 2025.
By sound, Kinley also includes the spellings Kynlee.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).