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).
Ryder climbed for decades and has been a steadily popular name ever since. All-time it's been given to 69,088 U.S. babies, the 237th most common name by sound today, peaking at 4,298 in 2015, with 2,821 in 2025.
Ryder has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).