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).
Cora has climbed over the years and is holding near its high. All-time it's been given to 165,956 U.S. babies, the 228th most common name by sound today, peaking at 4,264 in 2019, with 3,031 in 2025.
By sound, Cora also includes the spellings Kora.