Family name Mochak (Mochak 
, Мошак 
) , globally, is a rare last name. The family name Mochak is habitual in Ukraine, where it is quite a rare surname, Russia, where it is a very rare surname, and Kazakhstan. Measured by absolute frequency, this name is the most popular in Ukraine, Russia, and the United States. Very seldom, Mochak is the forename as well as the last name.