Baekje was established by immigrants from Goguryeo who spoke what could be a Buyeo language, a hypothetical group linking the languages of Gojoseon, Buyeo, Goguryeo, and Baekje.
Baekje blev etableret af indvandrere fra Goguryeo der talte, hvad der kunne være et Buyeo-sprog, en hypotetisk gruppe der forbinder sprogene talt i Gojoseon, Buyeo, Goguryeo, og Baekje.