Thank you for your question
My name is Clare
I shall od my best to help you but I need some further information first
Is the father named on the Birth Certificate and how old is your daughter?
Then I am afraid that you need his permission - or an Order form the court - to make any changes to her name at all.
You should try and discuss it with him using Family mediation.
If that fails then you can apply to the court for an Order - but will have more chance of success if you wish to double barrel the name
Please ask if you need further details
You are most welcome I hope all goes well