cog·no·men /kɑgˈnomən, ˈkɑgnə-/
  姓,綽號
  Cog·no·men n.
  1. The last of the three names of a person among the ancient Romans, denoting his house or family.
  2. Eng. Law A surname.
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  cognomen
       n 1: a familiar name  for a person (often a shortened version of
            a person's given name); "Joe's mother would not use his
            nickname and always called him Joseph"; "Henry's
            nickname was Slim" [syn: nickname, moniker, sobriquet,
             soubriquet]
       2: the name used to identify the members of a family (as
          distinguished from each member's given name) [syn: surname,
           family name, last name]
       [also: cognomina (pl)]