Cognomen Rocen (Rocen 
) , globally, is a rare family name. The cognomen Rocen is characteristic of Montenegro, where it is quite a rare surname, Czechia, where it is a rare surname, and Sweden. Not in comparison with a country's population, this name is the most popular in Czechia, Montenegro, and the United States. Very seldom, Rocen is the forename as well as the last name.