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).
Dominic is down from its peak but still widely used. All-time it's been given to 288,737 U.S. babies, the 168th most common name by sound today, peaking at 8,280 in 2012, with 4,040 in 2025.
By sound, Dominic also includes the spellings Dominick, Domenic, Dominik, Domenick.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).