Cognomen Ясс (Jass 
, Ясс 
) , throughout the world, is quite a common last name. The cognomen Ясс is characteristic of Western Asia, particularly Bahrain, where it is quite a rare surname, United Arab Emirates, and Qatar. Not in comparison with a country's population, it is commonest in the United States, United Arab Emirates, and South Africa. Also, Ясс is the forename as well as the last name.