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).
Tyson
Tyson is now well below its former popularity. All-time it's been given to 48,713 U.S. babies, the 834th most common name by sound today, peaking at 1,491 in 2009, with 565 in 2025.
Tyson has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).