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).
Renee was more common in the past and has since settled at a lower, steady level. All-time it's been given to 281,240 U.S. babies, the 1,046th most common name by sound today, peaking at 8,268 in 1962, with 489 in 2025.
By sound, Renee also includes the spellings Rene, Renae, Renea, Ranae.