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).
Juan
Juan is down from its peak but still widely used. All-time it's been given to 368,366 U.S. babies, the 296th most common name by sound today, peaking at 8,257 in 2005, with 2,318 in 2025.
Juan has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).