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).
Timothy is now well below its former popularity. All-time it's been given to 1,092,628 U.S. babies, the 431st most common name by sound today, peaking at 30,957 in 1959, with 1,741 in 2025.
By sound, Timothy also includes the spellings Timmothy.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).