What this tool is for

If your ex is talking about changing your child's surname, or has already done it without asking you, this tool helps you work out where you stand legally and what you can do next. It looks at your specific situation and gives you a plain answer.

Surname disputes are one of the most upsetting things separated dads contact us about. The law is clearer than most people realise, but it depends on a few key details, such as whether you have parental responsibility and whether the change is informal or being registered officially.

When to use it

Use it if you are a separated or divorced dad and any of the following apply. Your child's mother has suggested changing their surname to her maiden name, a step-parent's name, or a double-barrelled version. You have found out the new name is already being used at school, the GP, or on social media. You are not sure whether your consent is actually required, or what counts as a legal change versus a nickname.

It is also useful if you are thinking about the reverse, asking for your child to take or keep your surname, and you want to understand what the mother's rights are in that situation.

How it works

You answer a short set of questions about your situation, including whether you are on the birth certificate, whether a court order is in place, and what stage the name change has reached. You then get a written summary explaining your rights under UK law, whether your consent is needed, and the practical steps open to you, such as writing to the school, applying for a Specific Issue Order, or raising it through mediation. Nothing you enter is saved or shared, and you do not need to give your name or email to use it.