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AFIK, the author names are picked up from here:
File menu > Options command > General option > Personalize Your Copy of MS Office section. The author name is picked up from the "User Name" field.
Oops, that appears to be old or maybe even incorrect information. I can't verify it either way.
In my Word 2016 I went to File menu > Info command.
On the right side of the pane, under "Properties" there is a list of fields and their information displayed. Near the bottom is the Author field. The name displayed is my Windows login name. There is a button to "Add an Author" that picks up additional author names from Outlook. In 2010 it picks the names from the "Global Address List".