Cognomen Деклерк (Declercq 
, Деклерк 
, De-Klerk 
) , worldwide, is a common last name. The last name Деклерк is characteristic of Western Europe, particularly Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Luxembourg. In absolute terms, the name is most common in Belgium, France, and the United States. Very seldom, Деклерк is the forename as well as the last name.