I have a game and when I export it it is called Bounced! but in windows task manager the process appears as UE4.exe but with the logo of my game, how can I change this to Bounced.exe?
The name of the executable is dictated by the name of your *.uproject project file when you first create your project and package it, so if you already have an existing project called something like "UE4", you won't be able to change the name of the executable - it will always have the same name as the name of the project.
To change it on an existing project, it seems like you'll have to make a new project with a new *.uproject file, copy the old project over to the new project directory, delete the old .*uproject file, and then run it again and repackage it. Alternatively, you can rename that *.uproject file and then make any code changes to reference the new project name as needed, depending on if your project is blueprint-based or not. (Source)