The paternal grandfather of Prime Minister Anwar Ibrahim, based on his own words, was Tamil speaking Hindu, he claims from the Brahmin (priest) caste, albeit Keling!
Malaysian in Malaya at least who have roots in India and China, for example, can be Malay citizen, Borneo being different kettle of fish, being work in progress Equal Partnership Of Malay Federation And Borneo Territories in Malaysia under the Malaysia Agreement 1963 (MA'63)!