Cognomen טסטר (Tester 
, טסטר 
) , throughout the world, is a common last name. The family name טסטר is characteristic of the United Kingdom, where it is quite a rare surname, Australia, and Switzerland. Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Australia. Very seldom, טסטר is the forename as well as the last name.