I see, you are right, but I was answering to a more general point made by OP, that if those who speak your language arrived late, you could still have a connection with those who lived there before.
Culture and genetics are not necessarily related. Unless they still happen to speak Etruscan, sharing a little DNA with ancient Etruscans doesn't make them "Etruscan".
Toponyms often survive after a new language fully replaces the language of a people.
BTW Serbia is not really "north" in the Balkans. But still, it's pretty far away: on the opposite side of the Adriatic see and of the entire Italian peninsula (etruria is on the tyrrhenian coast)
