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).
Veronica was more common in the past and has since settled at a lower, steady level. All-time it's been given to 228,089 U.S. babies, the 788th most common name by sound today, peaking at 4,425 in 1980, with 773 in 2025.
By sound, Veronica also includes the spellings Veronika.