[nfg]

> For instance, I remember looking at a grocer's shop and the sign that said "Oranges", which looked very much like "Πορτοκάλια" in Greek.

And interestingly to extend this chain of connections I just read your comment and through my basic knowledge of the Greek alphabet gained through maths, and a rough proficiency in pronouncing Cyrillic I could spot that the word is very close to the Turkish “portakal” (I know a few words from spending some time there over the years).