Cognomen Триер (Trier 
, Триер 
, Trieur) , worldwide, is quite a rare family name. The family name Триер is habitual in Denmark, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Germany. Measured by absolute frequency, the name is most common in Germany, the United States, and Denmark. Very seldom, Триер is the forename as well as the last name.