Near Rhymes (similar vowel sound, but not exact):
* Canadian
* Venetian
* Ukrainian
* Ethiopian
Eye Rhymes (look similar, but don't sound the same):
* Pavlovian
* Cartesian
* Marian
Perfect Rhymes (very rare, but possible):
You'd have to get creative and use slang or invented words, as "Hawaiian" is quite specific in its sound. For example:
* "Hawaiian" (as a noun) + "ian" (as a suffix for a person from a place). For example: "He met a Hawaiianian on his trip."
Let me know if you have a specific context for the rhyme!