Office 2016: Where is the name of the user stored ?

If you deployed Office 2016 with a volume license, chances are your user will complain that the name used for reviews (or Auto-Track changes) is "Microsoft Office User" with initials "MO" (or any localized variation).

It is stored here : ~/Library/Group Containers/UBF8T346G9.Office/MeContact.plist

minidefrancois:~ fti$ defaults read "/Users/fti/Library/Group Containers/UBF8T346G9.Office/MeContact.plist"
{
    Initials = FTI;
    Name = "Francois Levaux-Tiffreau";
}

I started an idea, but don't have the time to figure out the Initials:

minidefrancois:~ fti$ defaults write "/Users/fti/Library/Group Containers/UBF8T346G9.Office/MeContact.plist" Name "`finger $USER | awk -F: '{ print $3 }' | head -n1 | sed 's/^ //'`"
minidefrancois:~ fti$ defaults read "/Users/fti/Library/Group Containers/UBF8T346G9.Office/MeContact.plist"
{
    Initials = MO;
    Name = "Francois Levaux-Tiffreau";
}