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).
Julian climbed for decades and has been a steadily popular name ever since. All-time it's been given to 319,925 U.S. babies, the 52nd most common name by sound today, peaking at 9,264 in 2016, with 8,145 in 2025.
By sound, Julian also includes the spellings Julianne, Julien, Jullian, Julieann.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).