Where does “rua” come from?

rua (Maori) comes from Proto-Eastern Polynesian rua, from Proto-Nuclear Polynesian rua, from Proto-Polynesian rua, from Proto-Oceanic rua, from Proto-Eastern Malayo-Polynesian duha, from Proto-Central-Eastern Malayo-Polynesian duha, from Proto-Malayo-Polynesian duha, from Proto-Austronesian *duha — two.

rua (Maori): two; pit; cavity