BlazeTo answer Connie’s surprise, starting a few years ago, the shelter wanted names to be unique, so they started assigning and tracking names. For a while, they did catagories, but found matching initial letters to be an easy way to refer to the kittens. I had a Binky this year, but had one years ago with that name because everyone else in his litter suckled on his ears. His adopter kept his name and he was a very big Binky. Sometimes I like the shelter names, sometimes not so much.
I give names by collar colors or looks because it helps me identify who is doing what. For instance, Greykin has not pooped yet, that I’ve found. He’s not bloaty and is gaining weight reasonably, so I don’t think he has a problem, but I’m watching him a lot. Usually I transition to the shelter names.