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Here is a snippet of something I wrote about Southern California place names:

Cahuenga, Topanga, Tujunga, Cucamonga, Pacoima and Azusa are all based on Tongva place names. The Tongva were the aboriginal peoples of the L.A. basin and western I.E. and south to Aliso Canyon in South Laguna. The Tongva name for Los Angeles before the white man was Yang-na. The San Gabriel area was Sibag-na, and the settlement near the pass to the huge valley was Cahueg-na. Topag-na might translate to "the place above". Present day Azuza was a small Tongva settlement called Asuksag-na. Cucamonga was a settlement named Cucamag-na and might mean "sandy place".