Ainu people
In Hokkaido, there is the Ainu language, which is spoken by the Ainu people, who are the indigenous people of the island. The Ainu languages, of which Hokkaido Ainu is the only extant variety, are isolated and do not fall under any language family. Ever since the Meiji period, Japanese has become widely used among the Ainu people and consequently Ainu languages have been classified critically endangered by UNESCO.