I have my camera set to name all my files starting with JRP-#### (Jack Rogers Photography) but, I can not leave my files like that because the counter will reset itself after 9999 captures. So, at one point I have to rename my files to avoid having multiple images with the same name.
There are many ways of naming files: by project, client, location etc… I tried them all and I quickly realized that maintaining consistency is next to impossible.
The only way that works for me is to name my files by date and sequence number.
Most of the time the output files out of Lightrom are going to be called the same as my raw files. For example,150823-0037.CR2 for raw and 150823-0037.jpg for the output file. If for some reason I need an output files with a different names I will call them:
150521-0019_w.jpg (for web) or
150823-0086_p.jpg (panorama)…… but, each file will start with the unique identifier so, I can easily find the corresponding master file.