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).
Dion
Dion is now well below its former popularity. All-time it's been given to 53,623 U.S. babies, the 1,084th most common name by sound today, peaking at 1,794 in 1970, with 408 in 2025.
By sound, Dion also includes the spellings Deon, Dionne, Deion.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).