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).
Lexi has been slowly declining from its former popularity. All-time it's been given to 48,346 U.S. babies, the 778th most common name by sound today, peaking at 2,064 in 2010, with 654 in 2025.
By sound, Lexi also includes the spellings Lexie, Lexy.