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).
Sophia
Sophia is down from its peak but still widely used. All-time it's been given to 439,619 U.S. babies, the 11th most common name by sound today, peaking at 22,354 in 2012, with 12,572 in 2025.
Sophia has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).