The correct term is indigenous, always with tilde. It means they're not strangers or foreigners. They are native to the region or the place. Locals, natural, indigenous, vernacular, Aboriginal, originating, native. Native Plural .
AUTOCTONOS plural of AUTACTNO , typical of the place where it is. It was born or originated in the place where it is located. 2 . Said of a person: originating in the country to which it belongs