CCQ-1991 - Civil Code of Québec

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53. If only the paternal or the maternal filiation of a child is established, he bears the surname of his father or of his mother, as the case may be, and one or more given names chosen by his father or mother.
A child whose filiation is not established bears the name assigned to him by the registrar of civil status.
1991, c. 64, a. 53.