Supposed list of who makes what: http://jgdarden.com/batteryfaq/batbrand.htm

Key messages from the link: Lead-acid battery manufacturers, distributors, exporters/importers, large chain/auto parts stores, or major dealers will often private label their batteries, for example in the North America, EverStart is private label for Walmart and DieHard for Sears and Kmart. These stores might have these private labeled batteries made by several manufacturers depending on the location to reduce shipping costs or to provide different types or sizes of batteries. Contracts with manufacturers might change.

That's why you see so many differing answers regarding who makes what. Retailers go with what gives them the largest margin, which inevitably changes over time and space. In the link you'll see same brands listed under different manufacturers.