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Family name Crass (Cras
, Crassus
, Crass
) , worldwide, is quite a rare cognomen. The surname Crass is habitual in Guernsey, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Belgium. Measured by absolute frequency, it most frequently occurs in the United States, France, and Belgium. Very seldom, Crass is the forename as well as the last name.