Cognomen Guerster (格斯特 
, Guerster 
) , around the world, is a rare last name. The family name Guerster is habitual in Germany, where it is a rare surname, Canada, where it is an extremely rare surname, and the United States. In absolute terms, it is the most numerous in Germany, China, and the United States. Very seldom, Guerster is the forename as well as the last name.