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).
Chloe is down from its peak but still widely used. All-time it's been given to 311,911 U.S. babies, the 56th most common name by sound today, peaking at 17,594 in 2010, with 7,456 in 2025.
By sound, Chloe also includes the spellings Khloe, Cloe, Kloe.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).