Bai-Maclay
Bai-Maclay was a Nuclear Trans New Guinea language once spoken in Papua New Guinea.
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Dumun is an endangered Madang language spoken in Madang Province, Papua New Guinea.
Dumun is reported to go by the name Bai, but evidently this is a distinct (though related) language, or at least a variety called Bai recorded by Maclay was distinct.
From Wikipedia · Dumun language · CC BY-SA 4.0