The Gwich'in word for the river is "Yu-kun", which translates to "great river" or "big river".
It's important to note that the name "Yukon" is not a direct translation of the Gwich'in word but rather a close approximation based on the sounds and meaning of the word. The Gwich'in language has a different phonetic system and a different structure compared to English, so a literal translation is not possible.
However, the meaning of the word "Yu-kun" as a "great river" accurately reflects the significance of the Yukon River to the Gwich'in people and to the history of the region.