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).
Mila has been climbing in recent years. All-time it's been given to 84,577 U.S. babies, the 106th most common name by sound today, peaking at 8,174 in 2018, with 4,802 in 2025.
Mila has no common alternate spellings by sound. Spellings sometimes heard the same way: Myla, Mylah.
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).