Hello. I am also a native speaker of Kadazandusun. This is a thesis talking about the name of the language in English, see page 135 for the official declaration in English (https://www.researchgate.net/publication/331561103_Planning_Kadazandusun_language_labels_and_identity). It would be good that the English name is also Kadazandusun if possible. Kadazan Dusun is different from Kadazandusun. Kadazan Dusun means the Kadazan dialect (is called Dusun Kadazan in some languages), while Kadazandusun is the larger continuum name that includes all Kadazan and Dusun dialects (is called Kadazandusun in all languages).