Last name Ласен (Lacen 
, Ласен 
) , around the world, is quite a rare cognomen. The surname Ласен is characteristic of Slovenia, where it is quite a rare surname, Puerto Rico, and the Dominican Republic, where it is a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Algeria, and Puerto Rico. Likewise, Ласен is the forename as well as the last name.