I don't disagree with your main point but your example is perhaps not so good. There are people who describe themselves as "Eskimo" and "Eskimo" is a reasonable

I don't disagree with your main point but your example is perhaps not so good. There are people who describe themselves as "Eskimo" and "Eskimo" is a reasonable name for the category that includes Inuit and Yupik. Of course there are also different kinds of Inuit and different kinds of Yupik. There's a tree diagram here (referring to languages rather than directly to people and this particular diagram uses the term "Eskimoan" rather than "Eskimo"): https://en.wikipedia.org/wiki/Eskaleut_languages#Internal_classification https://en.wikipedia.org/wiki/Eskaleut_languages#Internal_cl...