Well, I have a few propositions for you;
1) Samnitai, which is greek for Samnites. So they're basically Hellenic-ruled Samnites.
2) Italohellenes, or Italo-greeks in greek. They represent the ''free'' italic tribes ruled by the remnants of the Pyrrhic dynasty of Epeiros, seeking refuge in Megale Hellas.
3) Taras, after giving them the city itself to represent a free and again powerful city-state with Epeirotic rulers, refugees from Epeiros itself.