The above material seems to show that the Attacapa language is distinct from all others, except possibly the Chitimachan.    From Wordnik.com.  [Seventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1885-1886, Government Printing Office, Washington, 1891] Reference

In 1885 Mr. Gatschet visited the section formerly inhabited by the Attacapa and after much search discovered one man and two women at.    From Wordnik.com.  [Seventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1885-1886, Government Printing Office, Washington, 1891] Reference

Attacapa language was spoken also by another tribe, the “Carankouas,” who lived on the coast of Texas, and who conversed in their own language besides.    From Wordnik.com.  [Seventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1885-1886, Government Printing Office, Washington, 1891] Reference

= Attacapa, Latham in Proc.    From Wordnik.com.  [Seventh Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1885-1886, Government Printing Office, Washington, 1891] Reference