"Blend of De- and Shanna"
The name Deshanna is commonly a female name from the "American" origin.
Deshanna follows the American pattern of names built with a De- prefix, as in DeShawn and DeAndre, joined here to the English feminine name Shanna. That structure, together with a first appearance in United States birth records in 1969, points to a twentieth-century American formation rather than a name inherited from an earlier language with a recorded root meaning.
The pronunciation of Deshanna is duh-SHAN-uh.