I'm kind of a huge blacksmith nerd and one of my pet theories is that they named them based on the descriptions that were given in the request.
Making a bill for war vs agricultural is a few Hammer swings, a different heat treat, and a sturdier socket connection. Wasn't really much point and giving it a new name. Though there are a few examples of giving them a different name so they could charge more which I always found hilarious. It's basically the same thing that you see today when you have advertisements for "military grade".