A patronymic, or patronym, is a component of a personal name based on the given name of one's father, grandfather (avonymic), or an earlier male ancestor. A component of a name based on the name of one's mother or a female ancestor is a matronymic. A name based on the name of one's child is a teknonymic or paedonymic. Each is a means of conveying lineage.
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Patronymics are still in use, including mandatory use, in many countries worldwide, although their use has largely been replaced by or transformed into patronymic surnames. Examples of such transformations include common English surnames such as Johnson (son of John).