No, it's Mauretania only once, because that was the Roman name. English chose to use a slightly different name for the country, some other languages didn't.
Moor derives from mauri. To quote this site, "from Greek Mauros, perhaps a native name, or else cognate with mauros "black" (but this adjective only appears in late Greek and may as well be from the people's name as the reverse)."
Interestingly baku in Japanese seems to be a spirit/supernatural being that feeds on nightmares.. That or a tapir..
I am Greek. I can definitely say so
Mauros=black
so its not country of the moors but country of the blacks!