I have to interject, unfortunately. The origin of the word "drow" was the Scottish folklore equivalent of the norse "svartalfar" or "dokkalfar". It is pronounced as rhyming with "throw" and "row". Drow - Wikipedia, the free encyclopedia
EDIT: Even knowing this, I still pronounce it like "cow"
What he said. I was origninally taught it was pronounced as rhyming with cow as well, until I started reading up on Celtic mythology. It was there that I learned differently. Also, banshee is actually pronounced as BANE-she not BAN-she