Epiwafer 

I am surprised to learn that "epiwafer" was a popular term right around 2000-2002, the exact time that my company started to use epi wafers.  I should pay more attention to ads, I guess.  Anyway, it quickly settled back to more normal terminology, like "epitaxial wafer", looks like.  I guess another move is in order.    

Hi , I think it best to look at all those Google searches on the Talk page, and see which spelling/nomenclature  adding the web + book, singular + plural spellings (that's four searches for each spelling)  has the most hits, for the title of the article. If you want, I can do that and add them up. Of course, the company name will skew "epiwafer" so we can exclude that if you like.   
We don't use plurals, and book searches are generally more authoritative than web searches, but feel free to provide more data.    
Plurals are for the Google searches, because obviously many of the mentions (even in books) are only in plural, not singular, so an exact-phrase Google search (i.e., in quotation marks) will omit those mentions unless a plural form is searched. I'm fine with the fully spelled-out version as long as all of the other spellings redirect to it; therefore should probably also create a redirect for Epi-wafer, since that hyphenated form is sometimes used as well.   
Yes, good point(s).