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).
Carolina
Carolina has stayed fairly steady in American naming for generations. All-time it's been given to 48,108 U.S. babies, the 831st most common name by sound today, peaking at 1,270 in 2004, with 769 in 2025.
Carolina has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).