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Last name Yason (Yason , Ясон , Иасон ) , around the world, is quite a common cognomen. The last name Yason is characteristic of Japan, where it is quite a rare surname, Philippines, where it is a rare surname, and United Arab Emirates. Not in comparison with a country's population, it is commonest in Japan, Philippines, and Indonesia. Very seldom, Yason is the forename as well as the last name.