Surname בלאך (Bloch 
, בלאך 
) , worldwide, is a common cognomen. The cognomen בלאך is habitual in Denmark, where it is quite a common surname, Switzerland, and Israel (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Germany, the United States, and France. Very seldom, בלאך is the forename as well as the last name.