an additional name or an epithet appended to a name (as in `Ferdinand the Great')

A name shared in common to identify the members of a family, as distinguished from each member's given name, the name used to identify the members of a family (as distinguished from each member's given name), An appellation added to the original name; an agnomen, transitive verb_ To give a surname to, To name or call by an appellation added to the original name; to give a surname to, verb_ To give a surname, To call by a surname.