Are you named on the birth certificate of the child as the father?
As your name is XXXXX XXXXX child's birth certificate you have what is termed "parental responsibility" for the child. In order to legally change a child's name a change of name deed (ie. a deed poll) would have to be executed by all persons holding parental responsibility. This means that she would not be able to legally change the child's name without your consent. If she was minded to, she could apply to Court for an order that the child's name be changed but this would be fairly expensive and you would also receive notice of the application and be at liberty to defend your position
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