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).
Harmony
Harmony climbed for decades and has been a steadily popular name ever since. All-time it's been given to 41,814 U.S. babies, the 484th most common name by sound today, peaking at 2,104 in 2019, with 1,375 in 2025.
By sound, Harmony also includes the spellings Harmoni.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).