Asking a computer to suggest a name is impossible. It cannot know what name might be appropriate, and more importantly, what you think is appropriate.
However, you can just generate a random string of letters, and even numbers. As long or short as you like. Then test to see if that name (unlikely as it might be) is already in use. If it is, then just generate a new string, until you find one that is not already taken. The problem is, this will result in a list of names that are a complete mess in your directories. I doubt you will be happy.
Alternatively, you could just choose the name "untitled" (or something like that), followed by a number. If that name is already taken, then increase the number you will append, until it finds a name that is not in use.
