Is a marriage valid if conducted in the name of an adopted young man, while he is attributed to his adoptive father?

First: Islam has forbidden adoption, so it is not permissible for anyone to be ascribed to other than their father. Rather, they must be attributed to their father. If their father is not known, then they are attributed through brotherhood or walāʾ (allegiance). If the adopted person needs official identification papers and their father does not have a name, then the state should ascribe them to a fictitious composite name, not to a specific person or tribe.

Second: Correcting the name of the adopted person does not affect the validity of their marriage. What is required in marriage is the identification of the person concerned, regardless of their father's or family's name. It is obligatory for whoever wrongly ascribed someone to themselves in official documents to correct that, in order to change the adopted person's lineage, due to the implications this has for inheritance and maḥramiyyah (prohibition of marriage due to kinship). If this is not possible in official documents, then in their daily life, the truth of their lineage must be widely known, so that the rulings concerning maḥārim (unmarriageable kin) and inheritances are not confused.

The adopted person can be given names that signify servitude to Allah, such as Abdullah ibn Abd al-Karim, or names that are suitable for both males and females, such as Abdullah ibn Atiyatullah.