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).
Nina
Nina is now well below its former popularity. All-time it's been given to 138,934 U.S. babies, the 678th most common name by sound today, peaking at 2,002 in 1980, with 946 in 2025.
By sound, Nina also includes the spellings Nena.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).