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).
Sasha
Sasha is now well below its former popularity. All-time it's been given to 40,238 U.S. babies, the 1,044th most common name by sound today, peaking at 1,918 in 1988, with 461 in 2025.
Sasha has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).