Surname Boychak (Boychak 
, Бойчак 
) , in the entire world, is a rare family name. The surname Boychak is habitual in Eastern Europe, particularly Ukraine, where it is quite a rare surname, Czechia, where it is a rare surname, and Russia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ukraine, Russia, and the United States.
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