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).
Jayce
Jayce climbed for decades and has been a steadily popular name ever since. All-time it's been given to 47,162 U.S. babies, the 342nd most common name by sound today, peaking at 3,191 in 2015, with 2,230 in 2025.
Jayce has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).