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).
Damon
Damon is now well below its former popularity. All-time it's been given to 69,157 U.S. babies, the 861st most common name by sound today, peaking at 2,478 in 1976, with 604 in 2025.
Damon has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).