Đông Timor (Vietnamese) comes from Vietnamese Timor, from English Timor, from Malay Timor, from Malay timur, from Proto-Malayic timur, from Proto-Malayo-Polynesian timuʀ, from Proto-Austronesian timuʀ — south or east wind.
Ancestry of “Đông Timor”, step by step
Đông Timor traces back through two separate lines of ancestry.