| Language | Population | Bloc | Family | Cluster | Band | |
|---|---|---|---|---|---|---|
| ● Kiwai, Southern | 18,200 | Trans-New Guinea | Trans-Fly | Kiwaian | ||
| ● Bamu | 9,450 | Trans-New Guinea | Trans-Fly | Kiwaian | ||
| ● Kiwai, Northeast | 6,660 | Trans-New Guinea | Trans-Fly | Kiwaian | ||
| ● Kerewo | 6,260 | Trans-New Guinea | Trans-Fly | Kiwaian | ||
| ● Waboda | 3,670 | Trans-New Guinea | Trans-Fly | Kiwaian | ||
| ● Morigi | 1,990 | Trans-New Guinea | Trans-Fly | Kiwaian |