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).
Bradley is now well below its former popularity. All-time it's been given to 328,181 U.S. babies, the 667th most common name by sound today, peaking at 7,509 in 1980, with 873 in 2025.
By sound, Bradley also includes the spellings Bradly, Bradlee.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).