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).
Edwin
Edwin is now well below its former popularity. All-time it's been given to 248,744 U.S. babies, the 752nd most common name by sound today, peaking at 3,849 in 1922, with 798 in 2025.
Edwin has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).