WOW! SINCE WHEN YOU GOTTA PAY $8,200 A MONTH FOR CHILD SUPPORT WHEN THE PATERNITY HASN'T BEEN PROVEN YET!

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.