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).
Alexia is now well below its former popularity. All-time it's been given to 46,459 U.S. babies, the 1,410th most common name by sound today, peaking at 2,706 in 2002, with 239 in 2025.
By sound, Alexia also includes the spellings Aleksia.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).