 Although genetic relationships between the Huave language and several language families have been proposed, none has been substantiated, and Huave continues to be considered an isolate (Campbell 1997 pg.161).Paul Radin proposed a relationship between Huave and the Mayan and Mixe–Zoquean languages, and Morris Swadesh proposed a connection to the Oto-Manguean languages that has been further investigated by Rensch (1976), but all proposals have been inconclusive.