Adai
Adai was a language isolate once spoken in United States.
An isolate: no relationship to any other known language has been demonstrated.
Adai (also Adaizan, Adaizi, Adaise, Adahi, Adaes, Adees, Atayos) is an extinct Native American language that was spoken in northwestern Louisiana.
From Wikipedia · Adai language · CC BY-SA 4.0
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Elsewhere
Glottolog · adai1235 · Wikipedia (English) · Ethnologue · xad