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).
Laura is now well below its former popularity. All-time it's been given to 856,874 U.S. babies, the 717th most common name by sound today, peaking at 20,586 in 1964, with 863 in 2025.
By sound, Laura also includes the spellings Lora.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).