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 has been slowly declining from its former popularity. All-time it's been given to 23,826 U.S. babies, the 887th most common name by sound today, peaking at 1,398 in 2011, with 640 in 2025.
By sound, Lilianna also includes the spellings Lillianna, Lilyanna, Lillyanna.