Postby vijayjohn » 2021-10-28, 1:18
Ethnologue apparently lists eight languages as being spoken in Brunei apart from (more or less) Standard Malay. Of these, only two are Malayic, namely Brunei Malay (listed simply as "Brunei") and Iban, a language spoken all over Borneo including in Malaysia and Indonesia. Half (four languages) are North Sarawakan languages. Like them, the two remaining languages are also North Bornean languages (just not North Sarawakan).
The four North Sarawakan languages are Belait, Tutong, Eastern Penan, and Lun Bawang. Of these four, Belait and Tutong are the two that are most closely related to each other. They are both Lower Baram languages and thus closely related to the Berawan language spoken nearby in Sabah, Malaysia. Wikipedia seems to suggest that, yet express some doubt about whether, Eastern Penan is related to the Kenyah languages, which are also North Sarawakan. Lun Bawang belongs to a third subgroup within North Sarawakan called Apo Duat.
The two North Bornean languages that are not also North Sarawakan are Central Melanau and Brunei Bisaya. Central Melanau is a variety of the Melanau language, which is considered part of a group called Melanau-Kajang. Brunei Bisaya is a Southwest Sabahan language; despite the name of this subgroup, some Southwest Sabahan langauges (such as Brunei Bisaya) are spoken not in Sabah but rather in Borneo, including Brunei.