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).
Edna
Edna was a common American name in the 1910s but is rarely given today. It's been given to 296,158 U.S. babies all time and once ranked 120th by sound, peaking at 8,730 in 1918 (down to 72 in 2025).
Edna has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).