Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
When was the baby born?
How long have you lives apart?
Have you seen the baby?
What contact have you had since then
has she at least put your name on the Birth Certificate?
You can apply to the court for a specific issue order regarding the name being changed, and for a Child Arrangement Order setting out the time that the child will spend with you.
The fact that you are married and the child is newborn means that you have a good chance of the courts agreeing with you on the name
Your starting point is to attend a Mediation Information and Assessment Meeting with a Family Mediator - and if mediation is not successful you can then apply to the court using a form C100 and paying the fee of £215.
I hope that this is of assistance - please ask if you need further details
I hope that this has helped you understand your position