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).
Natalie is down from its peak but still widely used. All-time it's been given to 428,933 U.S. babies, the 173rd most common name by sound today, peaking at 12,895 in 2006, with 3,405 in 2025.
By sound, Natalie also includes the spellings Nathalie, Nataly, Nathaly, Natali.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).