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).
Jeremiah is down from its peak but still widely used. All-time it's been given to 239,582 U.S. babies, the 182nd most common name by sound today, peaking at 8,451 in 2010, with 3,924 in 2025.
By sound, Jeremiah also includes the spellings Jerimiah, Jeramiah, Jermiah.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).