Likely a modern blend or variation of Avon.
Avonna is a contemporary American name, likely created as a feminine elaboration of Avon, the name of several rivers in England. It may also be influenced by the Hebrew name Avona or the Italian name Ivona. Its usage is rare, appealing to parents seeking a melodic, multi-syllabic sound that feels familiar yet unique.
Less common today
Avonna isn't in the latest US Top 1000. It last peaked at #5,665 in 2018.
US births per 5-year period, 1990βpresent (SSA data).