How Greek was Egypt?

Are their any sources or atleast estimates about how many of acient Egypt's inhabitants had Greek at their mother tongue, or as a second language?
I know the big cities, like Alexandria, were heavily hellenised, but how heavily and what does that actually mean language-wise and percentage.wise?

I would be very thankful for all information on the topic :)
 
In what period?

Egypt had been under a Greek speaking administration since Ptolemaic times, of course, but it was only after Hadrian "enfranchised" the towns of Egypt by allowing them Greek-style councils that the country was brought fully into the mainstream of Graeco-Roman cultural life.

By the third or fourth century at the latest, all of the Egyptian landowning class, plus the urban poor, would've spoken Greek alongside Egyptian. For the peasant majority, Egyptian would've remained their primary tongue, but plenty of them would probably have had some knowledge of Greek alongside it.

For late antique Egypt, everyone of any political significance whatsoever, from clergy upwards, would have been fluent in Greek, although the majority would have spoken Egyptian (you can call the language "Coptic", but I believe this is somewhat frowned upon by academia) alongside it, perhaps in their personal lives. For the peasantry, I'd guess maybe a third had some grasp of Greek. So, in total, maybe 30-40% of the population.
 
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