de facto relationship? De facto couples (whether of different or same sex) and their children under 18 may apply on one form to register a change of name. Evidence of de facto relationship must be provided. Can I change the name of a child? It is possible to apply to change a child's name in a similar way to changing an adult's name, but both parents usually have to agree and sign the papers. A child over 12 years of age must agree to the new name, unless they do not understand what the change means. Where both parents do not agree to a name change, a family court order stating that it is in the child's best interests to have their name changed must be obtained before the Registry can register a change of name for the child. Where a court order has been obtained, it must be sent in with the application to the registrar for the name of the child to be changed. In certain circumstances the definition of parent will now include the same sex partner in a de facto relationship. This occurs as a result of changes to the Adoption Act 1994 (WA) and the Artificial Conception Act 1985 (WA). If you are under 18 and want to find out how to change your name, visit the Lawstuff website. Where can I get more information? For more information on changing your name or the name of a child go to Births Deaths and Marriages at