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).
Fernanda
Fernanda has stayed fairly steady in American naming for generations. All-time it's been given to 20,156 U.S. babies, the 916th most common name by sound today, peaking at 1,282 in 2009, with 549 in 2025.
Fernanda has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).