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).
Antonio
Antonio is now well below its former popularity. All-time it's been given to 264,970 U.S. babies, the 376th most common name by sound today, peaking at 5,089 in 1997, with 2,058 in 2025.
Antonio has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).