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).
Julius
Julius is now well below its former popularity. All-time it's been given to 85,038 U.S. babies, the 766th most common name by sound today, peaking at 1,422 in 1918, with 759 in 2025.
Julius has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).