How to rename Visual Studio
If you don't want to mess up with any files on you file system, one alternative is to reinstall the product.
After you uninstall the annoying product with the nickname "(2)", you can select the Installation locations tab and specify another nickname or perhaps leave it blank. Mine does not allow to leave it blank.
Here is a screen:
The issue is that the instance of visual studio has a nickname associated with it. Use the following instructions to change the nickname of an existing Visual Studio (tested with VS2017) installation (partially lifted from https://developercommunity.visualstudio.com/content/problem/99059/not-able-to-easiliy-change-installation-nickname.html):
Set the nickname in the *.isolation.ini files in %ProgramFiles(x86)%\Microsoft Visual Studio\2017\[Version]\Common7\IDE.
Set the nickname in the state.json file in %ProgramData%\Microsoft\VisualStudio\Packages\_Instances\[InstanceId]\state.json
Open regedit, go to under path HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall, find there "Visual Studio {your version} 2017 (2)". Rename string to be without " (2)" - this will change application name appearance in control panel / program and features.
You'll need admin permission to modify these files. If you want to remove the nickname altogether, just set it to an empty string (e.g. Nickname= in the .ini files, "nickname": "" in the .json).
Note that this will only have affect within VS tools, such as the VS installer in the screenshot you posted. Any names with the suffix in, for example, the Start/Windows menu will need to be renamed manually.