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).
Santiago is one of the fastest-rising names in America right now. All-time it's been given to 103,965 U.S. babies, the 75th most common name by sound today, peaking at 7,560 in 2025, with 7,560 in 2025.
Santiago has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).