Uto-Aztecan languages
The Kawaiisu homeland was bordered by speakers of non-Numic Uto-Aztecan languages: the Kitanemuk to the south spoke Takic, the Tubatulabal to the north spoke Tubatulabal, the Yokuts to the west were non-Uto-Aztecan. Because they shared the Southern Numic language, the Chemehuevi to the east are considered the closest relatives to Kawaiisu.