Otto Dempwolff in the context of "Austronesian languages"

The Austronesian languages (/ˌɔːstrəˈniːʒən/ AW-strə-NEE-zhən) are a language family widely spoken throughout Maritime Southeast Asia, parts of Mainland Southeast Asia, Madagascar, the islands of the Pacific Ocean and Taiwan (by Taiwanese indigenous peoples). They are spoken by about 328 million people (4.4% of the world population). This makes it the fifth-largest language family by number of speakers. Major Austronesian languages include Malay (one variant standardized as Indonesian), Javanese, Sundanese, Tagalog (standardized as Filipino), Malagasy and Cebuano. According to some estimates, the family contains 1,257 languages, which is the second most of any language family.

In 1706, the Dutch scholar Adriaan Reland first observed similarities between the languages spoken in the South East Asia Archipelago and by peoples on islands in the Pacific Ocean. In the 19th century, researchers (e.g. Wilhelm von Humboldt, Herman van der Tuuk) started to apply the comparative method to the Austronesian languages. The first extensive study on the history of the phonology was made by the German linguist Otto Dempwolff. It included a reconstruction of the Proto-Austronesian lexicon. The term Austronesian was coined (as German austronesisch) by Wilhelm Schmidt, deriving it from Latin auster "south" and Ancient Greek νῆσος (nêsos "island"), meaning the "Southern Island languages".