Ok, original file name = _DSC6485.JPG
I'll rename with shoot date, subject's name, original file name, and sequence I want them to appear
20060928_Morris{filename}_{seqn}
20060928_Morris_DSC6485.JPG_138.jpg
In PS CS / Automate / web gallery it'll take that file and call it 20060928_Morris_DSC648#C818.jpg
Another:
original = _DSC6459.JPG
renamed = 20060928_Morris_DSC6459.JPG_113.jpg
Photoshop calls it 20060928_Morris_DSC645#C828.jpg
I can find other examples if you need them. Sometimes it'll also insert long strings of numbers (8-16 digits), but usually it'll be combinations of capital letters and numbers.
Thanks for the help!