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).
Karina is now well below its former popularity. All-time it's been given to 103,549 U.S. babies, the 931st most common name by sound today, peaking at 4,272 in 1995, with 564 in 2025.
By sound, Karina also includes the spellings Carina, Corina, Corrina, Karena. Spellings sometimes heard the same way: Corinna.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).