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).
Luciana has been climbing in recent years. All-time it's been given to 16,629 U.S. babies, the 668th most common name by sound today, at an all-time high of 1,139 in 2025.
Luciana has no common alternate spellings by sound.