Natürlich ergibt das Sinn, die antiken Griechen haben sich was zusammengeschustert. Die hatten ja nicht mal ein Alphabet, mussten sich das bei den Nachbarn borgen. Ist in etwa so wie das eingedeutschte Latein, da wurde Hinz und Kunz gräzisiert. Siehe Alaksandu-Alexandros.
Siehe:
At first sight, it appears that the inhabitants of the Macedonian alluvial plain spoke Greek. A fourth-century curse tablet from Pella, published in 1994, is written in Northwest Greek, and later inscriptions are in Attic Greek. Many personal names (like Philippos and Alexandros, Zeus and Herakles) are Greek as well. That the Macedonians spoke Greek, looks like an inevitable conclusion.
However, there is some room for doubt. To start with, there are also Macedonian names that have no Greek parallel (Arridaeus or Sabattaras). In the second place, in many semi-literate societies, there is a difference between the spoken and the written language. It would not be without parallel if a Macedonian, when he wanted to make an official statement, preferred decent Greek instead of his native tongue. (Cf. the altars of the goddess Nehalennia, which were all written in Latin, a language that was almost certainly not spoken by the people who erected them.)
Thirdly, many historical sources are written in Greek, and it was a common practice among Greek historians to hellenize foreign names. For example, the name of the powerful first king of the Persian empire, Kuruš, ought to be transcribed as Kourous or Kouroux in Greek, but became Kyros, because this looks like a Greek word ("Mr. Almighty"). The name that is rendered as Alexandros, which has a perfect Greek etymology, may in fact represent something like Alaxandus, which is not Greek. A related argument that forces us to hesitate is that the Greeks nearly always converted the names of foreign deities. Supreme gods like Jupiter and Marduk are called "Zeus". So, the fact that Greek authors use Greek names for Macedonian people and deities does not prove very much about the Macedonian language.
None of this forces us to say that the Macedonians did not speak Greek, but it leaves the possibility that things were not what they seem. There is room for skepticism.
Macedonia
Old English Grecas, Crecas (plural), early Germanic borrowing from Latin Graeci "the Hellenes," from Greek Grakoi. Aristotle, who was the first to use Graikhos as equivalent to Hellenes ("Meteorologica" I.xiv), wrote that it was the name originally used by Illyrians for the Dorians in Epirus, from Graii, native name of the people of Epirus. 
. Das beschränkt sich nicht nur auf Toponymen sondern auch viele Wörter z.b. ist das heutige Wort Thalassa kein Indoeuropäisches wort . Dieses soll von der vorgriechischen Bevölkerung (Pelasger oder Ägäische sprachen nennt es wie ihr wollt) den ankommenden "Indoeuropäern" Proto-griechen weitergeben worden sein. Dieses würde auch sinn ergeben da sich viele Athenische Familien der Klassischen zeit sich ihrer "Pelasgischen vorfahren" rühmten. 