The name “San Diego” traces back to 1602 when Spanish explorer Sebastián Vizcaíno mapped the area and named the bay and surrounding region “San Diego de Alcalá” in honor of Saint Didacus of Alcalá. This marked the beginning of the city’s European identity, which would evolve over the centuries into the vibrant urban center known today.

Long before Spanish explorers arrived, the area was home to the Kumeyaay people. They called the settlement Kosa'aay, meaning “drying out place,” reflecting the local environment. After European settlement, the Kumeyaay referred to the growing town as Tepacul Watai, or “Stacked Big.” Nearby Luiseño-speaking communities in North County called the region Pushuyi, highlighting the rich linguistic and cultural diversity of the area prior to colonization.

San Diego’s name and its indigenous heritage reflect a layered history, blending centuries of Kumeyaay tradition with Spanish influence to form the unique identity of the city today.