Has the Greek alphabet been used for the written form of any languages other than the various ancient and modern forms of Greek?

Answer 1

1) In his commentaries of the Gallic war, Caesar tells us that the Gauls had adopted the Greek alphabet for their writing. This was why he sent his messages in Greek. So, that if they were captured the Gallic soldiers would not recognize it as a Roman correspondence.

2) The Etruscan alphabet was a modified Greek alphabet.

3) However, today the Cyrillic script used to write the Russian language is also a modification of Greek.