There is some good written guidance on document and file naming conventions. Below are a few entities that have made available their best practices on document naming conventions and protocol.
- Best Practices for File Naming, Department of Cultural Resources Office of Archives
- Naming Conventions for Electronic Documents, Alberta Government Canada
Standard Naming Conventions for Electronic Records, University of Edinburgh
This PC Magazine article, Getting Organized: Great Tips for Better File Names, provides some good context on why document naming conventions are so important and general aspects to consider when naming documents to make them easier to find.