Nobody here seems to understand how a .doc properties work. The author name will be that decided when Word was first used for that profile unless that is particularly changed. However, it is very common for people to make a document, not from a blank template, but from a pre-existing document. This pre-existing document may well have been made from another pre-existing document, which of course could have been written on another machine. Unless you actually access the properties to edit them, the properties of the very first document will continue to show.
A litttle known fact is that if you click 'send to email recipient' the title that shows in the subject of the email is not the title you have given the document but that written in properties. A colleague of mine decided to send a report to the Managing Director, that had been written modifying a document that had been written modifiying a document that had been written modifying a birthday message. The title of the report showed in the email subject line as 'I love you darling!'.