Cognomen Камен (Kamen 
, Камен 
, Camen 
) , worldwide, is quite a common last name. The surname Камен is characteristic of Bulgaria, where it is quite a common surname, Cameroon, where it is quite a rare surname, and Romania. In absolute terms, it is the most numerous in Bulgaria, the United States, and Cameroon. Likewise, Камен is the forename as well as the last name.