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).
Mina is now well below its former popularity. All-time it's been given to 19,939 U.S. babies, the 1,036th most common name by sound today, peaking at 523 in 2021, with 506 in 2025.
Mina has no common alternate spellings by sound.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).