If you want to find a Hawaiian name that shares a similar sound or meaning to "Joni," you could consider:
* "Iolani": Meaning "bird of royalty" or "high chief."
* "Jonah": A Hawaiian name with a similar sound.
* "Joani": This spelling could be seen as a Hawaiian adaptation of the name "Joni."
Ultimately, the best way to find a fitting Hawaiian name would be to consider the meaning and cultural significance of the name you're looking for.