Family name แบ็ค (Baek 
, Bac 
, Baack 
) , in all the world, is a common cognomen. The cognomen แบ็ค is characteristic of Guatemala, where it is quite a common surname, Denmark, and France, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Guatemala, the United States, and China. Also, แบ็ค is the forename as well as the last name.