Mountain or hill
A modern American coinage likely blending the prefix 'Mon-' (from the French 'mont' for mountain) with the popular suffix '-tasia' (as seen in Anastasia). It is often chosen for its rhythmic, lyrical sound and its connection to nature and elevation.
Less common today
Montasia isn't in the latest US Top 1000. It last peaked at #6,981 in 2004.
US births per 5-year period, 1990βpresent (SSA data).