An Indo-European language which is a close cousin to Greek and also related to Thracian and Phrygian languages, suggested by A. Meillet (1913) and I. I. Russu (1938),[6] or part of a Sprachbund encompassing Thracian, Illyrian and Greek (Kretschmer 1896, E. Schwyzer 1959).
An Illyrian dialect mixed with Greek, suggested by K. O. Müller (1825) and by G. Bonfante (1987).
A Greek dialect, part of the North-Western (Locrian, Aetolian, Phocidian, Epirote) variants of Doric Greek, suggested amongst others by N.G.L. Hammond (1989) Olivier Masson (1996) and Michael Meier-Brügger (2003).[7][8][9]
A northern Greek dialect, related to Aeolic Greek and Thessalian, suggested among others by A.Fick (1874) and O.Hoffmann (1906).[7][10]
A Greek dialect with a non-Indo-European substratal influence, suggested by M. Sakellariou (1983).
A sibling language of Greek within Indo-European, Macedonian and Greek forming two subbranches of a Greco-Macedonian subgroup within Indo-European (sometimes called "Hellenic"),[4] suggested by Joseph (2001), Georgiev (1966)[11] and others.[12]
