Jeicó
Jeicó was a Nuclear-Macro-Je language once spoken in Brazil.
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Jeikó (Jeicó, Jeikó, Yeico, Geico, Eyco, Zyeikó) is an extinct language of southeastern Piauí, Brazil, known only from a 19th-century wordlist with interference from neighboring languages. It is considered a Macro-Jê language, but not always in the Jê language branch.
From Wikipedia · Jeikó language · CC BY-SA 4.0