English-based pronunciation:
* ah-kuh-HIGH (with emphasis on the last syllable)
* ah-KAY-hee (with emphasis on the second syllable)
Other possibilities:
* ah-kah-ee (with a softer "k" sound)
* a-ka-hee (with a short "a" sound and emphasis on the first syllable)
To figure out the correct pronunciation, you would need to know:
* The origin of the word: Is it a made-up word, a foreign word, or a misspelling?
* The context in which it is used: What is the sentence or the topic of discussion?
Without more information, it's impossible to say definitively how to pronounce "akahai."