From Proto-Polynesian *maui. Possibly related to the name Māui.
mauī
- left (the west side of the body when one is facing north)
mauī
- on the left side
- “mauī” in John C. Moorfield, Te Aka: Maori–English, English–Maori Dictionary and Index, 3rd edition, Longman/Pearson Education New Zealand, 2011, →ISBN.