Caddo

noun pl. -·dos or -·do

1. a member of any of a group of North American Indian peoples formerly living in Louisiana, Arkansas, and E Texas, now living mainly in Oklahoma
2. the Caddoan language of these peoples

Etymology: Louisiana Fr Cadaux, shortened < Sp Cadojodacho < Caddo kaduhdá·čuʾ, name of a major group of the Caddo confederacy