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).
Colton is down from its peak but still widely used. All-time it's been given to 191,630 U.S. babies, the 147th most common name by sound today, peaking at 8,192 in 2013, with 4,306 in 2025.
By sound, Colton also includes the spellings Kolton, Colten, Kolten.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).