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).
Kyson
Kyson has been climbing in recent years. All-time it's been given to 9,961 U.S. babies, the 870th most common name by sound today, peaking at 758 in 2023, with 648 in 2025.
Kyson has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).