One more thing...there are many variations of this word as names suc as Amauri, Mory (As in Mory Kante) and Omari. In fact if one replaces the A in these names with an O it means "Son of" (as it does in scotch/irish who got this from Kemet, according to Irish Pedigrees). So, "Amery" would mean Son of Mery.
Sound confusing? Thats one reason genealogy research is of importance.
Here is another explanation.
http://mathildasanthropologyblog.wordpress.com/2009/07/18/who-the-moors-really-were
If accepting this premise the word comes from "Mahur" meaning "the western lands" or "of the western lands" we must be careful because it could actually refer to...
http://www.thekeep.org/~kunoichi/kunoichi/themestream/amentet.html