surname

noun
  1. A hereditary name common to all members of a family, as distinct from a given name. noun
    Her surname is Smith, which is quite common in English-speaking countries.
    He changed his surname after getting married to reflect his partner's family name.
  2. To give a surname to someone; to call by a surname. verb
    In some cultures, individuals are surnamed after their father's first name.
    He was surnamed 'the Brave' due to his heroic deeds.