Divine or valley
A modern American variation likely blending the Latin 'Diana', meaning divine or heavenly, with the English 'Deanna', which can refer to a valley or a church official. It is a rare phonetic spelling that emphasizes a soft, three-syllable pronunciation.
Less common today
Deaunna isn't in the latest US Top 1000. It last peaked at #8,503 in 1992.
US births per 5-year period, 1990βpresent (SSA data).