TheOceanic languages are a branch of theAustronesian languages comprising some 450 languages spoken inPolynesia,Micronesia andMelanesia. Though covering a vast area, Oceanic languages are estimated to have only two million native speakers. The largest individual Oceanic languages areEastern Fijian with over 600,000 speakers, andSamoan with an estimated 400,000 speakers. TheGilbertese (Kiribati),Tongan,Tahitian,Māori andTolai (Gazelle Peninsula) languages each have over 100,000 speakers. Thecommon ancestor which is reconstructed for this group of languages is calledProto-Oceanic (abbr. "POc").
According toJohn Lynch,Malcolm Ross, andTerry Crowley's 2002 bookThe Oceanic Languages, Oceanic languages often formlinkages with each other. Linkages are formed when languages emerged historically from an earlierdialect continuum. The linguistic innovations shared by adjacent languages define a chain of intersecting subgroups (alinkage), for which no distinctproto-language can be reconstructed.[2]
Lynch, Ross, & Crowley (2002) propose three primary groups of Oceanic languages:
Roger Blench (2014)[4] argues that many languages conventionally classified as Oceanic are in fact non-Austronesian (or "Papuan", which is a geographic rather than genetic grouping), includingUtupua andVanikoro. Blench doubts that Utupua and Vanikoro are closely related, and thus should not be grouped together. Since each of the three Utupua and three Vanikoro languages are highly distinct from each other, Blench doubts that these languages had diversified on the islands of Utupua and Vanikoro, but had rather migrated to the islands from elsewhere. According to him, historically this was due to theLapita demographic expansion consisting of both Austronesian and non-Austronesian settlers migrating from the Lapita homeland in theBismarck Archipelago to various islands further to the east.
non-Austronesian, with some other languages traditionally classified as Austronesian may perhaps actually be non-Austronesian are spoken in theSolomon Islands andNew Britain (variousMeso-Melanesian languages).