What is the origin of the "slave" in Great Slave Lake, located in northern Canada?

The lake is named after the Slave, also called Slavey, Awokanak or Etchareottine self-name Dene Tha', group of Athabaskan-speaking Indians of Canada, originally inhabiting the western shores of the Great Slave Lake, the basins of the Mackenzie and Liard rivers, and other neighbouring riverine and forest areas. Their name, Awokanak, or Slave, was given them by the Cree, who plundered and often enslaved numbers of them, and this name became the familiar one used by the French and English, for the Slave had a general reputation for timidity or pacifism, whether deserved or not.

https://www.britannica.com/place/Great-Slave-Lake