Interesting map you've got there! I guess the names of these nations would depend on the nations drawing the borders. They could be names derived from Latin, or other European languages, from Arabic, or even from Chinese, if in this world China seized Africa of parts of it. Or more likely, they'd have indigenous names, maybe with foreign spellings.
Looks like the Democratic Republic of the Congo/Zaire has the same problem here as in our timeline: it's too large, and encompasses too many unrelated ethnicities and language groups.