Any Ghanean or Guinnean people reading? A question for you guys!?

in the case of IMF chief (accused of rape), american say that the victim, a chamber maid, black from Ghanean origine...and her name is : Nafissatou DIALLO. I think this is not a Ghanean name but could be from Senegal or Guinnee, or even Mali . Am i right? Why don't american know that?