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).
Josephine
Josephine has been climbing back after years of decline. All-time it's been given to 332,458 U.S. babies, the 206th most common name by sound today, peaking at 8,709 in 1918, with 4,126 in 2025.
Josephine has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).