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).
Lilianna is now well below its former popularity. All-time it's been given to 17,243 U.S. babies, the 1,046th most common name by sound today, peaking at 995 in 2011, with 477 in 2025.
By sound, Lilianna also includes the spellings Lilyanna, Lillyanna.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).