Gracious
A modern American creation likely formed by combining the popular prefix 'De-' with the name Shanna. Shanna itself is often a variant of Shannon or a diminutive of Shoshana, ultimately carrying the meaning of divine grace or lily.
Less common today
Deshanna isn't in the latest US Top 1000. It last peaked at #7,563 in 1990.
US births per 5-year period, 1990βpresent (SSA data).