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).
Legacy
Legacy has been climbing in recent years. All-time it's been given to 8,483 U.S. babies, the 776th most common name by sound today, peaking at 1,095 in 2021, with 673 in 2025.
Legacy has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).