Most holy
Ariannah is a modern elaboration of Arianna, which is the Italian form of the Greek name Ariadne. It combines the classical roots of 'ari' (most) and 'adnos' (holy) with a contemporary American spelling preference for the 'h' ending.
Less common today
Ariannah isn't in the latest US Top 1000. It last peaked at #2,550 in 2015.
US births per 5-year period, 1990βpresent (SSA data).