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).
Anastasia has climbed over the years and is holding near its high. All-time it's been given to 62,277 U.S. babies, the 418th most common name by sound today, peaking at 1,966 in 2019, with 1,890 in 2025.
By sound, Anastasia also includes the spellings Anastacia.