Most holy or silver
Arianni is a modern elaboration of the Greek name Ariadne, meaning 'most holy,' or potentially a variant of the Italian name Arianna. It may also be influenced by the Welsh word 'arian' meaning silver. Its usage in the United States is relatively recent and reflects a trend toward melodic, multi-syllabic names.
Less common today
Arianni isn't in the latest US Top 1000. It last peaked at #3,701 in 2012.
US births per 5-year period, 1990βpresent (SSA data).