Thank you Niko, 

 I hope it's ok to continue in English, just in case someone else would like to join us. 

 I had a look at the link and located some more links. 
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 The author of this book, Aristides Constantinides gives some statistics: 135.000 words of Greek origin in English language, representing 25% of the total. It should be interesting to buy this book. 

 There is something strange about Greek language though. More and more words of Greek origin enter the English vocabulary every day. Words like atomic, astronaut, photon, cloning, etc. mostly scientific, have came into use only the last 100 years or so. It's still a dynamic language, not a dead one.