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).
Aurora is one of the fastest-rising names in America right now. All-time it's been given to 99,214 U.S. babies, the 86th most common name by sound today, at an all-time high of 7,070 in 2025.
By sound, Aurora also includes the spellings Arorah.