Southern California Languages
Image by Travis S.
The Chumash language is very unique in that there are no languages that are closely related to it. Much like Basque of Finnish it’s an isolate surrounded by a group of languages that have an obvious familial tie.
The only language I know about in this list is the Uto-Aztecan. There is a theory that the Utes started in California and made their way west throughout the Great Basin. This is seen by the high numbers of diverse, but related languages clustered in western California, with a broad, large spread of the language family in lands further east. Later the language group pushed south to Mexico.