Cognomen Bidach (Бидаш 
, Bidach) , in the entire world, is a rare surname. The cognomen Bidach is characteristic of Belarus, where it is a rare surname, Russia, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Russia, Belarus, and Ukraine. Also, Bidach is the forename as well as the last name.