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).
Julio
Julio is now well below its former popularity. All-time it's been given to 64,197 U.S. babies, the 1,065th most common name by sound today, peaking at 1,564 in 1990, with 436 in 2025.
Julio has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).