Go for an odd name, the motherboard....Mutherboard....hardly original but it's a....
All suggestions aside, creating a series of boards rather than grand new names every motherboard might be an idea, similar to cars, they don't try and change the names too much because it causes confusion, they just do new models every few years with updated specs....should be the same for motherboards, cases that way you build brand recognition. They could create a category, call it Experimental where they put all the Top of the line feature motherboards etc.