←
Proto-Austronesian *duSa (inherited)←
Proto-Central-Eastern Malayo-Polynesian *dua (derived)←
Proto-Oceanic *rua (inherited)←
Proto-Eastern Polynesian *rua (inherited)←
Proto-Nuclear Polynesian *rua (inherited)←
Proto-Polynesian *rua (inherited)←
Proto-Malayo-Polynesian *duha (inherited)←
Proto-Eastern Malayo-Polynesian *dua (inherited)