ProtoAustroTai
ProtoAustroTai is a reconstructed, hypothetical ancestor language of the Austronesian and Tai-Kadai language families. While there is no direct evidence of ProtoAustroTai's existence, linguistic reconstruction suggests a common origin for these two major language groups. The theory posits that a single proto-language, spoken perhaps in Southeast Asia, diverged over time into distinct branches that eventually led to the modern Austronesian and Tai-Kadai languages. Evidence for this connection comes from shared vocabulary, similar grammatical structures, and sound correspondences observed between the two families.
The proposed homeland for ProtoAustroTai is generally considered to be somewhere in East or Southeast Asia,