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).
Jordan is down from its peak but still widely used. All-time it's been given to 646,136 U.S. babies, the 119th most common name by sound today, peaking at 24,847 in 1997, with 4,260 in 2025.
By sound, Jordan also includes the spellings Jordyn, Jordon, Jorden, Jordin, Jordynn, Jourdan.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).