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).
Carlos
Carlos is down from its peak but still widely used. All-time it's been given to 309,076 U.S. babies, the 295th most common name by sound today, peaking at 6,864 in 2001, with 2,418 in 2025.
Carlos has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).