How to read the band →
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).
Monica
Monica is now well below its former popularity. All-time it's been given to 262,067 U.S. babies, the 1,183rd most common name by sound today, peaking at 6,821 in 1979, with 389 in 2025.
By sound, Monica also includes the spellings Monika.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).