Family name Bigun (Bigun 
, Бигун 
) , throughout the world, is a rare cognomen. The cognomen Bigun is characteristic of Eastern Europe, particularly Belarus, where it is a rare surname, Russia, and Hungary. Not in comparison with a country's population, this name is the most popular in Eastern Europe, particularly Russia, Ukraine, and Belarus. Much less frequently, Bigun is the forename as well as the last name.