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).
Kylie has fallen well below its former popularity. All-time it's been given to 213,646 U.S. babies, the 376th most common name by sound today, peaking at 9,771 in 2008, with 2,048 in 2025.
By sound, Kylie also includes the spellings Kylee, Kiley, Kyleigh. Spellings sometimes heard the same way: Kaili.