Last name Byba (Byba 
, Биба 
, Быба ) , globally, is quite a rare family name. The family name Byba is habitual in Ukraine, where it is quite a rare surname, Belarus, and Kazakhstan, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Byba is the forename as well as the last name.