What does lua mean in Hawaiian?
Lua is the number two, and separately a pit, hole or crater. Context tells you which, and the two senses are unrelated.
The crater sense runs through place names across the islands wherever the ground has opened. The number sense gives Kapalua, the two borders, and the ordinary counting word.
Lua is also the name of the Hawaiian martial art of bone-breaking, taught to a restricted class of warriors.
Say it LOO-ah. Every vowel is pronounced, and the capitalized syllable takes the stress. The pronunciation guide covers the rules.
On this site lua is part of 3 names: 0 begin with it, 3 end with it. Most are girl names, and all of them sit in the group of Hawaiian names meaning earth.