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).
Alicia is now well below its former popularity. All-time it's been given to 277,005 U.S. babies, the 719th most common name by sound today, peaking at 8,826 in 1984, with 860 in 2025.
By sound, Alicia also includes the spellings Alysha, Alysia, Alesha, Alesia, Elicia, Alisia, Aleisha, Ellycia. Spellings sometimes heard the same way: Alisha, Elisha, Alecia.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).