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).
Elle
Elle climbed for decades and has been a steadily popular name ever since. All-time it's been given to 19,247 U.S. babies, the 852nd most common name by sound today, peaking at 890 in 2019, with 668 in 2025.
Elle has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).