Cognomen Bysko (Bysko 
, Бысько 
, Быско 
) , throughout the world, is a rare last name. The last name Bysko is characteristic of Belarus, where it is a rare surname, Poland, and Estonia. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Russia, Poland, and Belarus. Also, Bysko is the forename as well as the last name.