Probably a form of Doreen or Dorina, linked to Greek doron meaning gift.
Dorinna is probably related to Doreen or Dorina, and at the deepest level it links back to Greek doron, meaning gift. That root has generated many names across European languages, often in forms that feel soft, affectionate, and distinctly feminine.
Dorinna takes that same tradition and gives it a slightly fuller, more embellished shape, which makes it feel both familiar and uncommon. The name has a gentle, vintage charm. Dorinna sounds like a name that could belong to an older literary heroine, yet its relative rarity keeps it from feeling fixed to any one era.
It sits comfortably among diminutive and ornamental names that were often created to sound graceful rather than to preserve strict etymological transparency. Dorinna carries the gift meaning in the background, but what people hear first is its warmth, musicality, and slightly old-fashioned sweetness.