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).
Kingsley
Kingsley has stayed fairly steady in American naming for generations. All-time it's been given to 8,874 U.S. babies, the 1,167th most common name by sound today, peaking at 667 in 2020, with 315 in 2025.
Kingsley has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).