Where does “rua” come from?

rua ('Are'are) comes 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, from Proto-Austronesian duSa — two.

rua ('Are'are): two