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).
Noor has been climbing in recent years. All-time it's been given to 12,815 U.S. babies, the 964th most common name by sound today, peaking at 626 in 2025, with 626 in 2025.
By sound, Noor also includes the spellings Nour.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).