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).
Jayleen is now well below its former popularity. All-time it's been given to 26,909 U.S. babies, the 978th most common name by sound today, peaking at 1,317 in 2011, with 408 in 2025.
By sound, Jayleen also includes the spellings Jaylene, Jailene, Jaeleen.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).