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).
Elsie
Elsie has been climbing back after years of decline. All-time it's been given to 190,958 U.S. babies, the 411th most common name by sound today, peaking at 5,221 in 1918, with 2,236 in 2025.
Elsie has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).