What is the hawaiian translation for piko?

"Piko" is already a Hawaiian word, so it doesn't need to be translated. It means "navel" in Hawaiian.

However, if you are looking for a related word, you might be thinking of "piko" as it is used in the context of "piko ʻāina", which means "center of the land" or "heartland". This term is often used to refer to the center of the island of Hawaiʻi.