As prescribed at Clause 3 Article 26 of the Civil Code:

Article 26. Right to have family and given names

1. Each natural person has right to have a family name and a given name (including a middle name, if any). The family and given names of a person shall be the family and given names in the birth certificate of such person.

2. The family name of a person shall be passed from his/her biological father's or mother’s as mutually agreed between the parents; if the parents fails to agree, the person’s family name shall be determined according to customary practices. If the father of such person is undetermined, his/her family name shall be passed from his/her natural mother’s.

If an abandoned child whose natural parents are unidentified is adopted, his/her family name shall be passed from his/her adoptive father’s or mother’s as mutually agreed between the parents. If the child has either an adoptive father or an adoptive mother, his/her family name shall be passed from such person’s.

If an abandoned child whose natural parents are unidentified and he/she has not been adopted but has been fostered by a foster establishment or a , his/her family name shall be determined at the request of the head of such foster family or at the request of the person registering the birth of the child.

Biological father and mother specified in this Code means a father and mother determined at the event of parturition; intended father and mother and the resulting child as prescribed in the Law on marriage and families.

3. The naming is restricted in case it violates lawful rights and interests of other people and contravenes basic principles of civil law prescribed in Article 3 of this Code.

The name of each Vietnamese citizen must be in Vietnamese or other ethnic minority languages of Vietnam and not include any figure or any symbol other than a letter.

4. Each natural person shall enter in and perform his/her civil rights and obligations following his/her family and given name.

5. A person may not use his/her code name or pen name to cause damage to the lawful rights and interests of other people.

Accordingly, the name of a Vietnamese citizen must be in Vietnamese or another ethnic language of Vietnam; Do not name with a number or a character that is not a letter.

Thus, parents are not allowed to give Korean names to their children with Vietnamese nationality when registering their birth.