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).
Santino has been climbing in recent years. All-time it's been given to 13,624 U.S. babies, the 772nd most common name by sound today, peaking at 934 in 2025, with 934 in 2025.
Santino has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).