- Atakapa, Attacapan - a member of an Indian people formerly living along the Gulf coast of Louisiana and Texas
--1 is a kind of Plains Indian, Buffalo Indian
- Atakapa, Atakapan, Attacapa, Attacapan - a language spoken by the Atakapa people of the Gulf coast of Louisiana and Texas
--2 is a kind of Amerind, Amerindian language, American-Indian language, American Indian, Indian