The Kumeyaay, also known as the Diegueño, are Native American people of the extreme southwestern United States and northwest Mexico. They live in the states of California (in the U.S.) and Baja California (in Mexico). In Spanish, the name is commonly spelled kumiai. Divisions and language Historically, the Kumeyaay have often been divided into three groups. Along the coast two groups were approximately separated by the San Diego River: the northern Ipai (extending from Escondido to Lake He… (More on Kumeyaay)