I had a flick through the later books and couldn't find it being used anywhere (Aurors are variously referred to by surname, first name, both, or title + surname when the title is something other than Auror ("Professor Moody"). That doesn't prove that it's never used, though ...
99% sure that it isn't. There aren't actually that many named Aurors in the series, and AFAIR everybody just refers to them by their surname when "on the job".
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I've read the potter books plenty of times and never noticed it, and not enough fanfic to be aware of fan usage.
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