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).
Myra is now well below its former popularity. All-time it's been given to 103,886 U.S. babies, the 885th most common name by sound today, peaking at 2,081 in 1990, with 577 in 2025.
By sound, Myra also includes the spellings Mayra, Maira.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).