Doing research on WikiTree in 2022 or early 2023, I came across a white man who lived with Native Americans I think in Mackinac Island, Michigan, then spent time in the Chicago area and negotiated treaties to cede their lands. Unfortunately I don't remember his name right now or the particular source, but one of the things that was mentioned was that he created several place names in the north Illinois, south Wisconsin area that sounded like Indian words but were just gibberish. Why he would do that I have no idea, since he apparently knew at least one native language.
Also, some words and names came from the English and French first talking to competing tribes, and may not cast them in the best light. For instance, the Sioux (as in Sioux Falls, South Dakota) actually go by the name Dakota or Lakota (meaning friend or ally). The word "Sioux" came from the Ojibwe word for little snakes, referring to their old enemy.