I made a texturepack minecraft 1.8.9?

But when I get into the game I can choose it but then by and the name of someone else I have the same folder verwenjdet but everything rsausgetan how can I now change this by zuz my name has windows 8.1

Open and edit pack.mcmeta file.

But you should note, that you are not allowed to publish it that way if you just take textures from others. Of course, textures also have copyright.