What is the ruling on someone who is called and known by other than the names of his father and grandfather, for fear of falling under the Hadith: "He who claims to be other than his father"?
It is permissible to call a man by his maternal grandfather's name, or by his title, or his family, or his tribe, if it does not alter a religious ruling, or cause a loss of right, or mix lineages, or change official documents. This is not considered a disavowal of one's lineage, which is forbidden. Al-Hasan and Al-Husayn, may Allah be pleased with them, were called "the sons of the Messenger of Allah, peace and blessings be upon him." Examples of this include Abu Shajarah ibn Sharid, Muhammad ibn Abd al-Rahman ibn As'ad ibn Zurarah, Imam al-Baghawi, Ibn Shahin, Abu al-Fadl al-Sulaymani, Ibn Shaddad, and others. The intent behind the prohibition of claiming lineage to other than one's father is false claim that leads to the mixing of lineages, the alteration of inheritances, and the forbidding of what is lawful and the permitting of what is unlawful.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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