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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).
Lillian
Lillian has been easing down from its peak but is still widely used. All-time it's been given to 509,556 U.S. babies, the 145th most common name by sound today, peaking at 10,256 in 1918, with 4,685 in 2025.
By sound, Lillian also includes the spellings Lilian, Lilyan, Lilyann, Lillyann, Lillyan.
Rising