Sorry, deary -
Africa is large and complicated, and without knowing which language you are talking about, your information isn't worth much at all.
Very often, people invent etymologies for names, sometimes from ignorance, sometimes from a position of imperfect knowledge. So one must always check carefully.
I must say that "
Queen of the pure ones" doesn't sound too convincing to me, but without some hard facts to go on, I can't say.