Thank you very much for the question!
Unfortunately, FBX export is not my strong suit. Could you please share with me some screenshots of the issue for better understanding?
Looking forward to hearing from you!
Sorry for the late reply, I have been full at work.
Here is the screenshot showing the object's name in AC23 (for this example) and then the FBX imported into Blender. As you can see the names are not the same, this doesn't happen with all the objects, mainly with this door.
Since this GDL object was built by someone I'm not sure if there is a mistake in their code that make this to happen, I have some knoledge about gdl so if you can think on some place where I can take a look in the code let me know please.