Indigenous

​The word indigenous has its beginnings in the Proto-Indo-European (PIE) root gene (to give birth, to beget), the source of dozens of English words. From this root comes Latin indigena (sprung from the land, native—literally, ‘in-born’ or ‘born in’ (a place). The Latin term indigenus means to be born or to be native to a particular country, region, or area. The English word indigenous (born or originating in a particular place) is from the 1640s. In this literal sense, everyone could be considered ‘indigenous’ in relation to the place where they were born.
 
However, more specifically, today the term indigenous is used to describe “the ethnic groups who are the original or earliest known inhabitants of an area, in contrast to groups that have settled, occupied, or colonized the area more recently. Groups are usually described as indigenous when they maintain traditions or other aspects of an early culture that is associated with a given region.” https://en.wikipedia.org/wiki/Indigenous_peoples
 
Reference: Online Etymological Dictionary, https://www.etymonline.com/