Personally, I follow Roland's Patch and Category Conventions. If you own a Super-JV synth, you can see their Categories along with the patch info. And they include with their L-CD Sample CDs their complete naming system info.
Since I have thousands of Roland Patches in Gigs of storage, I find it easier to stay with their naming convention so that my custom Patches are more easily accessed amidst the huge quantity of sounds I have to wade through.
* Roland & Cakewalk Resources and Roland Newsgroups: http://www.lilchips.com