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).
Roberto
Roberto is now well below its former popularity. All-time it's been given to 113,477 U.S. babies, the 976th most common name by sound today, peaking at 2,132 in 1991, with 519 in 2025.
Roberto has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).