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 is now well below its former popularity. All-time it's been given to 278,801 U.S. babies, the 1,030th most common name by sound today, peaking at 8,186 in 1962, with 489 in 2025.
By sound, Renee also includes the spellings Rene, Renae, Renea.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).