What do you think of this name for a puppy?

There is a potential the dog might get confused about its name if someone mispronounces it, but I wouldn't fight with your mother on this. If she paid for the dog and helps take care of it, there isn't much you can do. If someone comments to you that the name sounds stupid, you can always tell them your mom named the dog. I wouldn't say it in a mean or nasty way, but just make it clear you didn't pick the name. It's likely after a while that one of her friends might say something about it and you won't have to worry.