A client asked: My wife and I have been raising her son. The biological father had passed. How can we change his surname to mine?
You can change the surname of a minor:
- If a child is born out of wedlock and the mother marries a person other than the child’s biological father and wishes to change the child’s surname to that of her husband.
- If a mother, after her divorce from or the death of her husband (father of child), wishes to change the child’s surname to her maiden surname or to another surname she bore legally; or if she has remarried, to the surname of her new husband.
- If a child is born out of wedlock but registered under the biological father’s surname and the mother wishes to change the child’s surname to hers
- If a minor is under the care of a guardian and the guardian wishes to change the child’s surname to his/hers.
- Other situations not mentioned above where a good and sufficient reason for the change exists.
Applications must be on a duly completed Form BI-193.
Requirements:
- The natural father’s written consent, unless waived by a competent court is a statutory requirement in the case where the child was born in wedlock.
- The mother’s husband, whose surname the child is to assume, must also give his written consent to the assumption.
- Both the natural parents’ written consent is required as well as a good and sufficient reason, in writing, for the change. Obviously, in this case – because the father has died – his consent is not a requirement.
Source
https://www.bregmans.co.za/altering-the-surname-of-a-minor/