Whenever you export subtools from zbrush you get Group#### for object names. Fixing the problem manually is not a problem if you have a couple of objects. But in some projects these objects can go beyond a hundred. It is a time consuming process to fix them manually. This script changes the Group#### name of the object with the name of the obj file. given your subtools named properly your objects will be imported with correct names instead of Group followed with sequence of random numbers. Backup your .obj files, copy them all to a new folder, run the tool, find and select the newly created folder from the popup dialog. Tool will run and modify each obj file in this folder. Wait for the small window to disappear. Fixed files will be slightly larger but will work fine anyway. Executable is in the .rar file. Tool is a simple python file converted to exe for convenience. Although I scanned it with avira, you should scan it with your antivirus to be safe.
There is a preview at https://youtu.be/rNNKobHubYs