Hi @Ac.Dynamo,
I would recommend using the Batch Save Utility for Civil 3D. You can define a .scr script file that calls AECCRUNDYNAMOSCRIPT, then process a folder of DWGs using the tool. More documentation here and here.
Here’s an example that renames the first layout in each DWG to match its drawing file name.
RenameLayoutsBatchProcess.7z (806.7 KB)