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).
Jason
Jason is down from its peak but still widely used. All-time it's been given to 1,100,734 U.S. babies, the 247th most common name by sound today, peaking at 56,802 in 1977, with 2,713 in 2025.
By sound, Jason also includes the spellings Jayson, Jasen, Jaysen.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).