Surname Rysko (Rysko 
, Риско 
) , in all the world, is a rare cognomen. The cognomen Rysko is habitual in Lithuania, where it is quite a rare surname, Poland, where it is a very rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in Lithuania, Poland, and the United States. Likewise, Rysko is the forename as well as the last name.