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In page Sakha Republic:

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The exonym Yakut comes from the Evenk term Yako (also yoqo, ñoqa, or ñoka), which was the term the Evenks used to describe the Sakha. This was in turn picked up by the Russians.[1] The Yukaghirs, another neighboring people in Siberia, use the exonym yoqol ~ yoqod- ~ yoqon- (Tundra Yukaghir) or yaqal ~ yaqad- ~ yaqan- (Kolyma Yukaghir).[citation needed]