How about:

Iberian-Caucasian (language links; tentative) Iberi, Lusotanaan, etc.
Greco-Roman (they are very similar) - Romani, KH, Maks, etc.
Indo-Iranian - Baktria, Pahlava, Pontos, Hayasadan
Celtic - Casse, Arverni, Aedui, Belgae, Celtiberi, Norici, etc.
Germanic - Sweboz, Heruskoz, etc.
Afro-Asiatic/Semitic - Sab'yn, Ponnim, Feenikim, Aithiopkoi, etc.
Paleo-Balkan (includes Balto-Slavic, heritage links) Getai, Thraikioi, etc.