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).
Desmond climbed for decades and has been a steadily popular name ever since. All-time it's been given to 43,896 U.S. babies, the 687th most common name by sound today, peaking at 1,165 in 2017, with 911 in 2025.
By sound, Desmond also includes the spellings Dezmond.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).