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A name used for a Child other than what is registered on the Child’s Birth Certificate, is often referred to as an “informal” or “assumed” name.
Some parents just start using a different surname for the child, without either discussing it or getting the agreement of the other parent.
Some schools and other organisations will use as the name for the child, whatever name a parent writes on forms such as school enrolment forms.
The “informal” use of a different surname for the child, other than the child’s name as shown on their Birth Certificate, often becomes the commonly used name for the child, rather than what is on the birth certificate.
Especially in older children, that “informal” name, rather than their registered Birth name, will often become the name by child the Child identifies themselves.
Other Questions answered in the Change of a Child's Surname Section
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