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 654th most common name by sound today, peaking at 1,139 in 2025, with 1,139 in 2025.
Luciana has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).