The baby boy Beyonce's dad, Mathew Knowles, may or may not have sired definitely doesn't resemble him in one major way: The kid has baby mama Alexsandra Wright's last name.



There's no mention at all of Mathew on little Nixon's birth certificate -- the box titled "NAME OF FATHER" is blank.

So for now Nixon won't have Mathew's last name -- except on the $8,200-a-month child support check Mr. Knowles must pay.

A DNA test is scheduled for March 1.