Again, way off topic, so I won't go into details, but as a sort of overview, the so-called "list of nations" in verses 9-11 is just that; a list of geographical places. Specifically, the lands of the Diaspora (both Eastern and Western). It is not a list of languages. In fact, nowhere in the entire Pentecost narrative is even one language ever referenced by name, and nowhere does it imply that even though there were Jews from all over the Diaspora, that communication between them all was ever an issue to begin with.
One has to ask - if I were a Jew living in one of these places in the 1st century AD, what would be my native language, the language of "hearth and home", the language "wherein I was born"? Would it have ben a local language, or something else?
In a nutshell, the language of hearth and home for someone from the Western Diaspora was Greek. These countries had been Hellenized for centuries and Greek was beginning to be seen as an acceptable language for Judaism. For Judea, it was Aramaic, and for those of the eastern Diaspora....it was also Aramaic.
Though the Eastern Diasporan lands were never Hellenized, and each had its own language(s), they were never the language of 'hearth and home' for the Jews. The language of hearth and home, the language 'wherein they were born' was Aramaic. They of course spoke the local language in varying degrees of fluency, just like today's immigrants in the US do for English, but at home and amongst themselves it was Aramaic.
A lot of people, a lot of places, but for Jews amongst themselves, really only two languages: Greek and Aramaic, with Aramaic being by far the one most spoken.