When you write a CV you should always call the file by your name.
Don’t use “newcv.doc”, “mycv.doc” or similar, because so many people use that format that you’re just making the recruiter’s job harder to find your saved details.
I also see a lot of CVs that have file names related to the date it was written or updated, which is also a mistake as it can confuse the recruiter where that date is sometime in the past. They start to wonder if this is the latest version of your CV?
This might seem to be a minor point, but a good CV is defined by getting all the minor points right.