Great or moon
Mhia is a modern variant of Mia, which itself has multiple origins. It is often considered a diminutive of Maria, meaning 'bitter' or 'beloved', but in various contexts, it is associated with the Latin 'mea' meaning 'mine' or the Sanskrit 'Maya' meaning 'illusion'.
Less common today
Mhia isn't in the latest US Top 1000. It last peaked at #11,117 in 2012.
US births per 5-year period, 1990βpresent (SSA data).