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).
Roy
Roy was more common in the past and has since settled at a lower, steady level. All-time it's been given to 411,331 U.S. babies, the 1,009th most common name by sound today, peaking at 7,592 in 1947, with 570 in 2025.
Roy has no common alternate spellings by sound.
Rising