Family name Болен (Bolen 
, Bohlen 
, Болен 
) , worldwide, is a common surname. The cognomen Болен is habitual in Switzerland, where it is quite a common surname, Germany, where it is quite a rare surname, and the United States. Measured by absolute frequency, it is commonest in the United States, Germany, and India. Much less frequently, Болен is the forename as well as the last name.