matronym
A matronym is a personal name derived from the name of a mother or maternal ancestor. In naming systems, it is the counterpart to a patronym, which is derived from the father’s name. A matronymic form can function as a given name or as a surname, depending on linguistic tradition and legal practices.
Etymology: The term combines matro-, from the Latin matrona meaning mother, with -nym, from the Greek onoma
Usage and context: Patronymic naming is widespread in many historical and cultural contexts, but matronymic forms
Examples: If a mother is named Mary, a child might bear a matronymic surname such as Marysson