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).
Janet
Janet was a common American name in the 1950s but is rarely given today. It's been given to 558,291 U.S. babies all time and once ranked 224th by sound, peaking at 18,507 in 1954 (down to 61 in 2025).
Janet has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).