Surname Käpp (Keppi 
, Käpp , Кяпп 
) , worldwide, is a rare cognomen. The family name Käpp is characteristic of Estonia, where it is quite a rare surname, France, where it is a rare surname, and Ukraine, where it is a very rare surname. Measured by absolute frequency, the name is most common in France, Brazil, and Estonia. Much less frequently, Käpp is the forename as well as the last name.