Last name Джансон (Janson 
, Jahnson 
, Джансон 
) , across the world, is a common surname. The last name Джансон is characteristic of Marshall Islands, where it is a common surname, Sweden, where it is quite a common surname, and Estonia. In absolute terms, it most frequently occurs in the United States, Germany, and Sweden. Very seldom, Джансон is the forename as well as the last name.