Thank you very much for the information and the reference books!
My question was a bit inaccurate, I'm afraid. I shouldn't have asked about "the Greeks", but rather about the process of Hellenization of (part of) the Jewish culture. The Septuagint obviously reflects this: The Hebrew names in the bible were shaped into a Greek-like form, which supposedly existed before. A 3rd cent. BCE Jew in Alexandria
would probably call his children Elisabeth
and Yoanan instead of Elisheva
and Yokhanan. (I have no idea, if this is true.)
Now going back (or ratehr forth) to the 4th cent. law you are talking about, we would find Elisabeth
again, but now Yoannes instead of Yoanan. So the rules may have changed …
This is what I'd like to know more about. Maybe I can get hold of one of the books you mention. So thanks once more!