Sonoma is a place name most associated with California; its deeper root is likely Indigenous, though often filtered through Spanish usage.
Sonoma is a place-name turned personal name, rooted in the indigenous languages of California long before European settlers arrived. The most widely accepted etymology traces it to the Coast Miwok or Southern Pomo word for "valley of the moon" — a translation immortalized by Jack London, who named his beloved Northern California ranch the Valley of the Moon and wrote a novel by the same name in 1913. Other linguistic scholars point to a Wappo-language source meaning "earth nose" or "hand nose," referring to geographical features of the valley.
Whatever the precise origin, the name carries the scent of old California: fog-threaded mornings, ancient redwoods, and the volcanic soil of wine country. Sonoma County and the town of Sonoma itself became globally famous as the heart of California's wine industry, and with that reputation came an association with a certain cultivated, land-rooted sensibility — the slow-food movement, organic farming, artisan production. The name absorbed those cultural overtones and began appearing as a given name in the late 20th and early 21st centuries, particularly among families with connections to California or affections for nature-rooted place names.
As a baby name, Sonoma belongs to a growing family of California place-names-turned-first-names — alongside Sierra, Shasta, and Marin — that carry both regional pride and a broader sense of natural beauty. It is unpretentious but evocative, easy to say and hard to forget, and for many parents it carries a genuine emotional geography: a specific light, a specific landscape, a specific feeling of home.