Surname Бойсен (Boysen 
, Бойсен 
) , worldwide, is quite a common cognomen. The cognomen Бойсен is characteristic of Denmark, where it is quite a common surname, Namibia, where it is quite a rare surname, and Germany. Measured by absolute frequency, the name is most common in Germany, the United States, and Denmark. Much less frequently, Бойсен is the forename as well as the last name.