Cognomen Декер (Decker 
, Deker , Dekere 
) , in all the world, is a common family name. The surname Декер is habitual in Western Europe, particularly Luxembourg, where it is quite a common surname, Germany, and Belgium (explore the name in all countries). In absolute terms, the name is most common in the United States, Germany, and Belgium. Much less frequently, Декер is the forename as well as the last name.