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).
Ricardo
Ricardo is now well below its former popularity. All-time it's been given to 147,169 U.S. babies, the 730th most common name by sound today, peaking at 3,055 in 1998, with 833 in 2025.
Ricardo has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).