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).
Eric is down from its peak but still widely used. All-time it's been given to 1,150,527 U.S. babies, the 232nd most common name by sound today, peaking at 29,106 in 1980, with 2,723 in 2025.
By sound, Eric also includes the spellings Erik, Erick, Erich, Aric.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).