Surname Shagen (Шаген 
, Shagen 
) , around the world, is a very rare last name. The cognomen Shagen is characteristic of Georgia, where it is a rare surname, the United States, where it is a very rare surname, and Russia, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Georgia, and Nigeria. More prevalently, Shagen is the forename as well as the last name.