noun (n)

• a familiar name for a person (often a shortened version of a person's given name)(noun.communication)

  Synonym:
  byname, moniker, nickname, sobriquet, soubriquet
  

  source: wordnet30
• the name used to identify the members of a family (as distinguished from each member's given name)(noun.communication)

  Synonym:
  family name, last name, surname
  

  source: wordnet30
• The last of the three names of a person among the ancient Romans, denoting his house or family.(noun)

  source: webster1913