Who is the surname of the child born without a marriage certificate?

Legal analysis: Children without marriage certificate usually take their mother's surname, but of course they can also take their father's surname. If you need to take your father's surname, you need to do paternity test to prove the relationship between father and son (female) before you can write your father's name on the birth certificate.

Legal basis: Article 107 1 of the Civil Code of People's Republic of China (PRC) states that children born out of wedlock enjoy the same rights as those born in wedlock, and no organization or individual may harm or discriminate against them. The biological father or mother who does not directly raise children born out of wedlock shall bear the responsibility for raising minor children or adult children who cannot live independently.