Bamayo (Bumayoh), listed in Ethnologue simply as "Malayic Dayak", is a MalayicDayak language of Borneo.
Dialects form a chain that may be better considered three languages. Ethnologue lists them as southern: Delang [200,000 speakers] and Kayung [100,000]; western: Banana’ [100,000] and Tapitn [300]; and eastern: Mentebah-Suruk [20,000], Semitau [10,000], and Suhaid [10,000]; and additionally (not arranged geographically): Arut (Sukarame), Lamandau (Landau Kantu), Sukamara (Kerta Mulya), Riam (Nibung Terjung), Belantikan (Sungkup), Tamuan, Tomun, Pangin, Sekakai, Silat.