However, you could use a name with a similar meaning or sound:
* Kekoa: Meaning "brave" or "warrior," this name shares a strong and dignified quality with Gregory.
* Keoni: This name, meaning "beautiful," could evoke the elegance of the name Gregory.
* Gregoria: This is a possible feminine form of Gregory that could be used.
Ultimately, choosing a Hawaiian name is a personal decision. You could also consider using a similar-sounding name like "Gregori" or "Greg."