Hello Audrey. When I received my data file from University of Michigan there was no personal identification either within the file or in the file name. They do that for security purposes. I left it as is when I uploaded to Gedmatch. Now, if you'd like, you could use initials, the earliest known ancestors or your own nick name for each, both on the data file you download and as the identifier for the file when you upload to Gedmatch so you can keep multiple files straight. Doing it this way, even if someone hacked in and got the data, there would be no way to know exactly who it was unless you attached it to a person in a tree with their name or the hacker had a live dna sample of that person to test and compare. By using "living" instead of their name in the tree, their privacy is protected.