found: Work cat.: Nurul Izzati Haji Mohammed Jamil. Young dreams, 2009:p. vii (Dayang Nurul Izzati Haji Mohammed Jamil, a young writer of this country [i.e., Brunei]; Bruneian) p. 95 (was a student at primary school of Persatuan Guru-Guru Melayu Brunei, Sungai Akar; she also studied at Saint Andrew School; at the pre-university level she studied at Maktab Duli Pengiran Muda Haji Al-Muhtadee Billah, Gadong [Brunei])
found: The world factbook, via WWW, Feb. 29, 2016(Brunei. Location: Southeastern Asia, along the northern coast of the island of Borneo, bordering the South China Sea and Malaysia. Nationality: noun: Bruneian(s), adjective: Bruneian. Languages: Malay (official), English, Chinese dialects)
found: Dickson, P. Labels for locals, 2006(Brunei (State of Brunei Darussalam): Bruneian, which is also an adjective)
found: Wikipedia, Dec. 13, 2023:Languages of Brunei (The official language of the state of Brunei is Standard Malay) Brunei (demonym: Bruneian)
found: Dayang Rokiah Haji Mohd. Salleh. Orang Brunei di Pahang, 1988(title translates as Bruneians in Pahang) (OCoLC)969447596
found: Google translate, Dec. 13, 2023(Bruneians (English) = orang Brunei (Malay); Bruneian people (English) = orang Brunei (Malay))