| He can if he wishes challenge in court thier right to change the childs last name, since they can not without his approval if he is listed on the birth certificate and the child has his last name. ( and any change in many places) so if he does not like the childs name being changed, he may file a motion in court to have that over turned.
Yes he will have to pay child support ( which he should want to of course since it is his child and his moral obligation to do so) following the written child support decree. | 
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