Cognomen Хардт (Hardt 
, Хардт 
) , in the entire world, is a common surname. The family name Хардт is habitual in Western Europe, particularly Luxembourg, where it is quite a common surname, Germany, and Austria, where it is quite a rare surname. In absolute terms, it most frequently occurs in Germany, the United States, and Brazil. Much less frequently, Хардт is the forename as well as the last name.