Sentence:  As such, there arises a symbolic association between <WSD>endonymy</WSD> and the firstborn, and exonymy and the last-born, in keeping with the idea that the firstborn represents internal continuity and the last-born represents the transformation associated with exteriority. Indeed, in the practice of name-giving, the names of the firstborn come from the closest kin and from what is "inside", whereas the names of the last-born come from more distant kin and from what is increasingly "outside." 
Meaning of the word marked with <WSD> tags:  The use of the name for a group or geographic region by its members or inhabitants, as opposed to the nomenclature used by outsiders.