Cognomen Klimak (Klimak 
, Климак 
) , in all the world, is a rare last name. The family name Klimak is characteristic of Eastern Europe, particularly Slovakia, where it is quite a rare surname, Ukraine, where it is a rare surname, and Czechia. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Slovakia, and Russia. Much less frequently, Klimak is the forename as well as the last name.