Cognomen Finchuk (Finchuk 
, Финчук 
) , in the entire world, is a rare last name. The cognomen Finchuk is characteristic of Belarus, where it is a rare surname, Lithuania, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Russia, Belarus, and Kazakhstan. Much less frequently, Finchuk is the forename as well as the last name.