Family name Брен (Bren 
, Braine , Brenus 
) , in the entire world, is quite a rare last name. The last name Брен is characteristic of Guinea-Bissau, where it is quite a rare surname, Israel, and Slovenia. In absolute terms, it is commonest in the United States, the United Kingdom, and France. Likewise, Брен is the forename as well as the last name.