is the term for the idea that people with the same ethnic origins

Ethnicity

Explanation:

Ethnicity is a term that describes shared cultural practices, values, and beliefs of by a group of people. This might include shared but not limited to language, religion, and traditions, among other commonalities. The term “ethnicity” can be said to be "the idea that of people with the same ethnic origins" according to the question.

what group of people depend on what yoy are talking i will still you once you tell me what group of people you are talking about : )

i think i know what group you are talking about so the brahmins