Post your Outlook version. Post your default setting for the Full Name
field.
Support your theory. It is unclear what makes you think Outlook behaves that
way. I've never seen anything like it.

Signature
Russ Valentine
[MVP-Outlook]
> When a new contact is entered, it appears that the first name and middle
> name
[quoted text clipped - 3 lines]
> considered
> to be first names?