Hi...I play sporadically at Chess.com. ..mostly in the winter. It seems that a few years ago the site would show the country your opponent was from...yes, they show the country flag but there are many I can't place...it might be something the site might consider.
I used to study the flags on chess.com with a dictionary beside me, it had the flags on the first pages with their respective names. Maybe you can print a page or look up online and do the same as I did.