Proto-Austroasiatic is the reconstructed ancestor of the Austroasiatic languages. Proto-Mon–Khmer (i.e., all Austroasiatic branches except for Munda) has been reconstructed in Harry L. Shorto's Mon–Khmer Comparative Dictionary, while a new Proto-Austroasiatic reconstruction is currently being undertaken by Paul Sidwell.[2]
Scholars generally date the ancestral language to c. 3000 BCE – c. 2000 BCE with a homeland in southern China or the Mekong River valley. Sidwell (2022) proposes that the locus of Proto-Austroasiatic was in the Red River Delta area around c. 2500 BCE – c. 2000 BCE.[3] Genetic and linguistic research in 2015 about ancient people in East Asia suggest an origin and homeland of Austroasiatic in today southern China or even further north.[4]
500 Proto-Austroasiatic etyma were published by Paul Sidwell in 2024.[5]