Here are a few options you could consider, depending on the meaning you'd like to convey:
* Haʻaleʻa: This name means "bright, shining one" or "one who shines brightly" - this could represent Hayley's personality or spirit.
* Leilani: Meaning "heavenly flower" or "beautiful flower" - this name is commonly used in Hawaii and has a lovely, feminine sound.
* Moana: Meaning "ocean" or "sea" - this name is popular and could be a good fit if you're looking for something strong and powerful.
Ultimately, the best name for Hayley in Hawaiian depends on what you want to emphasize. You could also choose a name with a different meaning that you feel suits Hayley well.