"Koinon Hellenon" should be "Koinon Ellenon", due to the fact that greeks of that time didn't use the /h/ sound (even further back in history, however, they did); the eta letter (H) was, at the start of EB's timeframe, pronunced "e".
Sources: http://en.wikipedia.org/wiki/Koine_Greek
http://en.wikipedia.org/wiki/H
Edit: Changed "ê" to "e".
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