Soldier or merciful
A modern phonetic respelling of Miles. It likely derives from the Latin word 'miles' meaning soldier, or the Germanic element 'mild' meaning gracious or merciful.
Less common today
Mylz isn't in the latest US Top 1000. It last peaked at #8,710 in 2009.
US births per 5-year period, 1990βpresent (SSA data).