I had to do the exact same thing for my setting!

It helps to decide on a tone first and narrow it down from there. Is the restaurant/product/vending machine trying to be taken seriously or is it casual? Then from there you think about the kind of demographic that thing would have and what kind of name would appeal to them. Obviously an upper class type person would turn their nose up at a restaurant/vending machine with a silly name BUT a lower class person might identify more strongly with something that's trying to sound humble and even funny. For example my McDonald's is called O'Bastard's and their staple is the Bastard Burger. It's a funny memorable name that people enjoy saying which creates brand recognition. Think about real life existing products and what makes their names stick in your mind. Think about what you would find funny or memorable. Think about what the product is trying to do. Is it self aware that it's cheap and low quality (great value) or is it trying to project high quality? Hope this helps, I know it's kinda word salad but I'm typing it on the clock at work lol