Not enough facts -- as to who is on the birth certificate (probably not if he "doesn't know" etc.). I suggest that you consult with a family law specialist, but you could probably do a name change of the child. There are many other questions -- formal paternity, matters of child support, custody, etc. See a family law attorney -- if nothing else, the Thursday afternoon short consultations at Ask-A-Lawyer at family court.
Answered on May 13th, 2014 at 10:30 PM