John, No sorry that was not aimed towards you my friend. It was towards the troll Larcivs. My apologies.
Ok, no problem.
Your designs are certainly visually appealing in some ways so you have the "cool factor" going for you. Some of the other commenters are more aimed at trying to help you think about functionality as well (handle comfort, blade thickness, etc) so it's not so much that people are trying to troll you. More that they are trying to help.
Though your post clearly isn't asking for design help, just help with names. A name is both a marketing tool, as well as a way to capture the essence of an item in a single, memorable term or phrase. So if you ask someone "what should I name this" it is reasonable for the helper to ask more about the item and how it is intended to be used or the intended market.
So if I see something that looks to be designed with a handle that will hurt to use it, and I am trying to name it, "painful handle" sticks in my mind. So something like "Cuts Both Ways" or "Hurts Me More Than You" are ideas that arise.
Now if you designed the knife to only be used with heavy leather gloves then a handle design might make perfect sense that would hurt when used barehanded.
There are lots of knives (and other products) that are designed and sell well that aren't really intended for use but are for display or to impress others or ourselves. Nothing wrong with that. People can spend their money on what they want, and if there is a demand, you can make money filling it.
So if these are going to be some kind of fantasy / collect only / display or play knife, then the names might be something to evoke that, hence the early reference to computer games. If they are intended to be real, useful products, then the names should ideally evoke the idea or image that it would be useful in that role.
So "Brushbuster" makes you think of one thing, and "Doomslayer" makes you think of something else.
You could also borrow words from another language (such as CRK does) to make them sound interesting.
Eventually you will need to decide (or hire a marketing professional).
Otherwise it's just three random words from a bunch of random forum posters.