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Cognomen Rosko (Rosko
, Роско
, Roško
) , around the globe, is quite a rare surname. The family name Rosko is characteristic of Slovakia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Hungary. Not in comparison with a country's population, the name is most common in the United States, Slovakia, and Hungary. Very seldom, Rosko is the forename as well as the last name.