How to read the band →
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).
Luna
Luna is one of the fastest-rising names in America right now. All-time it's been given to 87,834 U.S. babies, the 61st most common name by sound today, peaking at 8,992 in 2022, with 6,085 in 2025.
Luna has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).