Both Gondor and Arnor (the kingdom of Aragorn's ancestors) are culturally
descended from the Numenoreans. Much of Aragorn's ancestry is Numenorean, and
some of Faramir is. Aragorn's Rangers are also of Dunedain blood (i.e.
ancesters dwelt in Numenor), but Faramir's are essentially Human, just with
inherited Dunedain culture.
Both traditions share a common ancestry with the Dunedain, which was itself
inherited from the Edain, who lived way, way, back, and were likely quite
different from Humans as we know them (although they were still
Mortal).
