Family name Клапп (Klapp 
, Клапп 
) , in the world, is quite a rare last name. The family name Клапп is characteristic of Luxembourg, where it is quite a rare surname, Germany, and Chile, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Chile. Much less frequently, Клапп is the forename as well as the last name.