If you don't like the default name your PC has, you can always learn how to change it. Changing your PC's name lets you call it whatever you like while getting rid of that non-descript ...

When Twitch first began, your username was largely cast in stone, difficult to change without deleting your entire account and starting over. Several years ago, Twitch made the welcome change to allow ...

You can change your Battle.net name, known as a BattleTag, once for free or again at-cost on the Blizzard Entertainment platform.