Here are some options to consider, depending on what you want to convey:
Based on meaning:
* Lani - "Sky" - if Deena has a strong, graceful, or ethereal nature.
* Lehua - "Flower of the lehua tree" - if Deena is beautiful, vibrant, or passionate.
* Malia - "Flower" - if Deena is kind, gentle, or loving.
* Nani - "Beautiful" - if Deena is attractive, both physically and internally.
Based on sound:
* Dina - closest phonetic approximation to "Deena"
Ultimately, the best Hawaiian name for Deena will depend on your personal preference and what you want to represent.