Basil II's Epitaph

[Seleukos]

Well,for Byzantines (as they are mostly found) :
Turks=Persians (Περσαι)
Georgians=Ibers (Ιβηρες)
Bulgars=Mysians (Μυσοι)
Pechenegs(or sometimes Cumans or other nomads)=Scythians (Σκυθαι)
Saracenes(muslims in general)=Saracens or Agarenoi(insulting) (Σαρακηνοι-Αγαρηνοι)
Serbians=Trivalloi (Τριβαλλοι)
Hungarians=Turks (Τουρκοι)
Westerns (Normans -Franks)=Celts (Κελται)
and so on..

Most of these are achaic names of factions and nations that lived in the same place where the previous nations settled.
So,since somebody should study Ancient Greek writers to be considered as well educated,beside the ancient "attic" dialect he should use these names too.