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 ...
(no subject)
Date: 2013-03-10 09:55 pm (UTC)(no subject)
Date: 2013-03-11 11:12 am (UTC)