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).
Lucille
Lucille is now well below its former popularity. All-time it's been given to 268,304 U.S. babies, the 571st most common name by sound today, peaking at 9,377 in 1918, with 1,340 in 2025.
By sound, Lucille also includes the spellings Lucile.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).