Oh I thought you were joking LOL.......
They are literally
from Yemen, and their casque resembles a veil. Simple common names based on easy-to-remember features. It doesn't really matter what you call it aside from its Latin name. Kinda like how panther chameleons are also often called rainbow chameleons. Most of it has to do with what the importers write down on the sheets they give to pet stores. No one wants to buy a Furcifer pardalis...but a PANTHER chameleon. Sell the sizzle, not the steak.
http://www.tysto.com/articles09/q1/20090331panther.shtml