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).
Ray was more common in the past and has since settled at a lower, steady level. All-time it's been given to 247,552 U.S. babies, the 731st most common name by sound today, peaking at 3,947 in 1957, with 817 in 2025.
By sound, Ray also includes the spellings Rae, Rey, Raye.