Why is "-2" appended to imported filenames?

Question

When I import picture files to LR 5.2 in OS X 10.8.5, almost always, "-2" is appended to file names.
Sometimes I find files in my LR catalog twice, once with the original name, and once with "-2" appended.
I've tried tracing it different importing workflows, but so far I haven't been able to isolate the perpetrator.
Here are some of my importing workflows:
* USB cable from camera to Mac
* USB cable from card reader to Mac
With the source device connected to Mac, sometimes I open it in one of these:
   - Image Capture
    - LR 5.2
   - iPhoto
Sometimes Image Capture, LR, or iPhoto is set to automatically recognize the attached picture source device, sometimes they are set to require manual opening.
Sometimes I create a desktop folder with the name it would have when LR imports it, sometimes the folder is a generic name.
Sometimes I move the folder with the destination LR to the final location in the directory tree, using OS X, before importing the files to the folder.
Sometimes I import files into the folder using one of the above applications, then move the folder to its final location.
Sometimes I transfer files into the folder using the OS X Finder, then move the folder to its final location.
Sometimes I import  files into the folder that's already been put in its final location.
Sometimes two, or all three, of LR and iPhoto and Finde,r are all looking at the source files at the same time, when the computer is connected to the camera or to the card reader.
I haven't tested all of these methods yet, so it's not clear which of these methods might be the cause of the "-2."
In LR, I have imports set to ignore files already imported, and to create a backup copy in a specific folder that's different from the one where the LR catalog is located.
Do any users on the forum have this same issue? Which one or more of the impot methods is the cause?
TIA

Answer 1

CStaack wrote:
LR puts a -2 behind a filename if this name already exists in the folder.
Maybe you use renaming when importing and managed to customize this in a way that always leads to the same filename.
Thanks for your reply.
I'll take another look. I'll try a test and not import files into the catalog from within folders located in the OS X directory tree, where I want them to be in the catalog's directory tree. I guess this could be called "import in place."
One reason I am trying to develop a workflow that's not LR's automatic import workflow, is that LR duplicates folders as subfolders within the directory tree, when it makes the folders for the import. I've been trying to avoid this. My camera is set to make a new folder for each day. Would this confuse LR?
I don't rename files when importing.
I'll report back when I have some results.